NCERT Textbook: National Income Accounting | Economics Class 12 - Commerce PDF Download

 Page 1


National Income Accounting National Income Accounting National Income Accounting National Income Accounting National Income Accounting
In this chapter we will introduce the fundamental functioning of a
simple economy. In section 2.1 we describe some primary ideas
we shall work with. In section 2.2 we describe how we can view
the aggregate income of the entire economy going through the
sectors of the economy in a circular way. The same section also
deals with the three ways to calculate the national income; namely
product method, expenditure method and income method. The
last section 2.3 describes the various sub-categories of national
income. It also defines different price indices like GDP deflator,
Consumer Price Index, Wholesale Price Indices and discusses the
problems associated with taking GDP of a country as an indicator
of the aggregate welfare of the people of the country.
2.1 SOME BASIC CONCEPTS OF MACROECONOMICS
One of the pioneers of the subject we call in economics today,
Adam Smith, named his most influential work – An Enquiry into
the Nature and Cause of the Wealth of Nations. What generates
the economic wealth of a nation? What makes countries rich or
poor? These are some of the central questions of economics. It is
not that countries which are endowed with a bounty of natural
wealth – minerals or forests or the most fertile lands – are naturally
the richest countries. In fact the resource rich Africa and Latin
America have some of the poorest countries in the world, whereas
many prosperous countries have scarcely any natural wealth.
There was a time when possession of natural resources was the
most important consideration but even then the resource had to
be transformed through a production process.
The economic wealth, or well-being, of a country thus does
not necessarily depend on the mere possession of resources; the
point is how these resources are used in generating a flow of
production and how, as a  consequence, income and wealth are
generated from that process.
Let us now dwell upon this flow of production. How does this
flow of production arise? People combine their energies with
natural and manmade environment within a certain social and
technological structure to generate a flow of production.
In our modern economic setting this flow of production arises
out of production of commodities – goods and services by millions
of enterprises large and small. These enterprises range from giant
Reprint 2024-25
Page 2


National Income Accounting National Income Accounting National Income Accounting National Income Accounting National Income Accounting
In this chapter we will introduce the fundamental functioning of a
simple economy. In section 2.1 we describe some primary ideas
we shall work with. In section 2.2 we describe how we can view
the aggregate income of the entire economy going through the
sectors of the economy in a circular way. The same section also
deals with the three ways to calculate the national income; namely
product method, expenditure method and income method. The
last section 2.3 describes the various sub-categories of national
income. It also defines different price indices like GDP deflator,
Consumer Price Index, Wholesale Price Indices and discusses the
problems associated with taking GDP of a country as an indicator
of the aggregate welfare of the people of the country.
2.1 SOME BASIC CONCEPTS OF MACROECONOMICS
One of the pioneers of the subject we call in economics today,
Adam Smith, named his most influential work – An Enquiry into
the Nature and Cause of the Wealth of Nations. What generates
the economic wealth of a nation? What makes countries rich or
poor? These are some of the central questions of economics. It is
not that countries which are endowed with a bounty of natural
wealth – minerals or forests or the most fertile lands – are naturally
the richest countries. In fact the resource rich Africa and Latin
America have some of the poorest countries in the world, whereas
many prosperous countries have scarcely any natural wealth.
There was a time when possession of natural resources was the
most important consideration but even then the resource had to
be transformed through a production process.
The economic wealth, or well-being, of a country thus does
not necessarily depend on the mere possession of resources; the
point is how these resources are used in generating a flow of
production and how, as a  consequence, income and wealth are
generated from that process.
Let us now dwell upon this flow of production. How does this
flow of production arise? People combine their energies with
natural and manmade environment within a certain social and
technological structure to generate a flow of production.
In our modern economic setting this flow of production arises
out of production of commodities – goods and services by millions
of enterprises large and small. These enterprises range from giant
Reprint 2024-25
10 10 10 10 10
Introductory Macroeconomics
corporations employing a large number of people to single entrepreneur
enterprises. But what happens to these commodities after being produced? Each
producer of commodities intends to sell her output. So from the smallest items
like pins or buttons to the largest ones like aeroplanes, automobiles, giant
machinery or any saleable service like that of the doctor, the lawyer or the financial
consultant – the goods and services produced are to be sold to the consumers.
The consumer may, in turn, be an individual or an enterprise and the good or
service purchased by that entity might be for final use or for use in further
production. When it is used in further production it often loses its characteristic
as that specific good and is transformed through a productive process into
another good. Thus a farmer producing cotton sells it to a spinning mill where
the raw cotton undergoes transformation to yarn; the yarn is, in turn, sold to a
textile mill where, through the productive process, it is transformed into cloth;
the cloth is, in turn, transformed through another productive process into an
article of clothing which is then ready to be sold finally to the consumers for
final use. Such an item that is meant for final use and will not pass through any
more stages of production or transformations is called a final good.
Why do we call this a final good? Because once it has been sold it passes out
of the active economic flow. It will not undergo any further transformation at the
hands of any producer. It may, however, undergo transformation by the action
of the ultimate purchaser. In fact many such final goods are transformed during
their consumption. Thus the tea leaves purchased by the consumer are not
consumed in that form – they are used to make drinkable tea, which is consumed.
Similarly most of the items that enter our kitchen are transformed through the
process of cooking. But cooking at home is not an economic activity, even though
the product involved undergoes transformation. Home cooked food is not sold
to the market. However, if the same cooking or tea brewing was done in a
restaurant where the cooked product would be sold to customers, then the
same items, such as tea leaves, would cease to be final goods and would be
counted as inputs to which economic value addition can take place. Thus it is
not in the nature of the good but in the economic nature of its use that a good
becomes a final good.
Of the final goods, we can distinguish between consumption goods and
capital goods. Goods like food and clothing, and services like recreation that
are consumed when purchased by their ultimate consumers are called
consumption goods or consumer goods. (This also includes services which are
consumed but for convenience we may refer to them as consumer goods.)
Then there are other goods that are of durable character which are used in
the production process. These are tools, implements and machines. While they
make production of other commodities feasible, they themselves don’t get
transformed in the production process. They are also final goods yet they are
not final goods to be ultimately consumed. Unlike the final goods that we have
considered above, they are the crucial backbone of any production process, in
aiding and enabling the production to take place. These goods form a part of
capital, one of the crucial factors of production in which a productive enterprise
has invested, and they continue to enable the production process to go on for
continuous cycles of production. These are capital goods and they gradually
undergo wear and tear, and thus are repaired or gradually replaced over time.
The stock of capital that an economy possesses is thus preserved, maintained
and renewed partially or wholly over time and this is of some importance in the
discussion that will follow.
Reprint 2024-25
Page 3


National Income Accounting National Income Accounting National Income Accounting National Income Accounting National Income Accounting
In this chapter we will introduce the fundamental functioning of a
simple economy. In section 2.1 we describe some primary ideas
we shall work with. In section 2.2 we describe how we can view
the aggregate income of the entire economy going through the
sectors of the economy in a circular way. The same section also
deals with the three ways to calculate the national income; namely
product method, expenditure method and income method. The
last section 2.3 describes the various sub-categories of national
income. It also defines different price indices like GDP deflator,
Consumer Price Index, Wholesale Price Indices and discusses the
problems associated with taking GDP of a country as an indicator
of the aggregate welfare of the people of the country.
2.1 SOME BASIC CONCEPTS OF MACROECONOMICS
One of the pioneers of the subject we call in economics today,
Adam Smith, named his most influential work – An Enquiry into
the Nature and Cause of the Wealth of Nations. What generates
the economic wealth of a nation? What makes countries rich or
poor? These are some of the central questions of economics. It is
not that countries which are endowed with a bounty of natural
wealth – minerals or forests or the most fertile lands – are naturally
the richest countries. In fact the resource rich Africa and Latin
America have some of the poorest countries in the world, whereas
many prosperous countries have scarcely any natural wealth.
There was a time when possession of natural resources was the
most important consideration but even then the resource had to
be transformed through a production process.
The economic wealth, or well-being, of a country thus does
not necessarily depend on the mere possession of resources; the
point is how these resources are used in generating a flow of
production and how, as a  consequence, income and wealth are
generated from that process.
Let us now dwell upon this flow of production. How does this
flow of production arise? People combine their energies with
natural and manmade environment within a certain social and
technological structure to generate a flow of production.
In our modern economic setting this flow of production arises
out of production of commodities – goods and services by millions
of enterprises large and small. These enterprises range from giant
Reprint 2024-25
10 10 10 10 10
Introductory Macroeconomics
corporations employing a large number of people to single entrepreneur
enterprises. But what happens to these commodities after being produced? Each
producer of commodities intends to sell her output. So from the smallest items
like pins or buttons to the largest ones like aeroplanes, automobiles, giant
machinery or any saleable service like that of the doctor, the lawyer or the financial
consultant – the goods and services produced are to be sold to the consumers.
The consumer may, in turn, be an individual or an enterprise and the good or
service purchased by that entity might be for final use or for use in further
production. When it is used in further production it often loses its characteristic
as that specific good and is transformed through a productive process into
another good. Thus a farmer producing cotton sells it to a spinning mill where
the raw cotton undergoes transformation to yarn; the yarn is, in turn, sold to a
textile mill where, through the productive process, it is transformed into cloth;
the cloth is, in turn, transformed through another productive process into an
article of clothing which is then ready to be sold finally to the consumers for
final use. Such an item that is meant for final use and will not pass through any
more stages of production or transformations is called a final good.
Why do we call this a final good? Because once it has been sold it passes out
of the active economic flow. It will not undergo any further transformation at the
hands of any producer. It may, however, undergo transformation by the action
of the ultimate purchaser. In fact many such final goods are transformed during
their consumption. Thus the tea leaves purchased by the consumer are not
consumed in that form – they are used to make drinkable tea, which is consumed.
Similarly most of the items that enter our kitchen are transformed through the
process of cooking. But cooking at home is not an economic activity, even though
the product involved undergoes transformation. Home cooked food is not sold
to the market. However, if the same cooking or tea brewing was done in a
restaurant where the cooked product would be sold to customers, then the
same items, such as tea leaves, would cease to be final goods and would be
counted as inputs to which economic value addition can take place. Thus it is
not in the nature of the good but in the economic nature of its use that a good
becomes a final good.
Of the final goods, we can distinguish between consumption goods and
capital goods. Goods like food and clothing, and services like recreation that
are consumed when purchased by their ultimate consumers are called
consumption goods or consumer goods. (This also includes services which are
consumed but for convenience we may refer to them as consumer goods.)
Then there are other goods that are of durable character which are used in
the production process. These are tools, implements and machines. While they
make production of other commodities feasible, they themselves don’t get
transformed in the production process. They are also final goods yet they are
not final goods to be ultimately consumed. Unlike the final goods that we have
considered above, they are the crucial backbone of any production process, in
aiding and enabling the production to take place. These goods form a part of
capital, one of the crucial factors of production in which a productive enterprise
has invested, and they continue to enable the production process to go on for
continuous cycles of production. These are capital goods and they gradually
undergo wear and tear, and thus are repaired or gradually replaced over time.
The stock of capital that an economy possesses is thus preserved, maintained
and renewed partially or wholly over time and this is of some importance in the
discussion that will follow.
Reprint 2024-25
11 11 11 11 11
National Income Accounting
We may note here that some commodities like television sets, automobiles
or home computers, although they are for ultimate consumption, have one
characteristic in common with capital goods – they are also durable. That is,
they are not extinguished by immediate or even short period consumption;
they have a relatively long life as compared to articles such as food or even
clothing. They also undergo wear and tear with gradual use and often need
repairs and replacements of parts, i.e., like machines they also need to be
preserved, maintained and renewed. That is why we call these goods
consumer durables.
Thus if we consider all the final goods and services produced in an economy
in a given period of time they are either in the form of consumption goods (both
durable and non-durable) or capital goods. As final goods they do not undergo
any further transformation in the economic process.
Of the total production taking place in the economy a large number of
products don’t end up in final consumption and are not capital goods either.
Such goods may be used by other producers as material inputs. Examples are
steel sheets used for making automobiles and copper used for making utensils.
These are intermediate goods, mostly used as raw material or inputs for
production of other commodities. These are not final goods.
Now, to have a comprehensive idea of the total flow of production in the
economy, we need to have a quantitative measure of the aggregate level of final
goods produced in the economy. However, in order to get a quantitative
assessment – a measure of the total final goods and services produced in the
economy – it is obvious that we need a common measuring rod. We cannot
add metres of cloth produced to tonnes of rice or number of automobiles or
machines. Our common measuring rod is money. Since each of these
commodities is produced for sale, the sum total of the monetary value of
these diverse commodities gives us a measure of final output. But why are
we to measure final goods only? Surely intermediate goods are crucial inputs
to any production process and a significant part of our manpower and capital
stock are engaged in production of these goods. However, since we are dealing
with value of output, we should realise that the value of the final goods already
includes the value of the intermediate goods that have entered into their
production as inputs. Counting them separately will lead to the error of double
counting. Whereas considering intermediate goods may give a fuller description
of total economic activity, counting them will highly exaggerate the final value
of our economic activity.
At this stage it is important to introduce the concepts of stocks and flows.
Often we hear statements like the average salary of someone is Rs 10,000 or the
output of the steel industry is so many tonnes or so many rupees in value. But
these are incomplete statements because it is not clear whether the income which
is being referred to is yearly or monthly or daily income and surely that makes
a huge difference. Sometimes, when the context is familiar, we assume that the
time period is known and therefore do not mention it. But inherent in all such
statements is a definite period of time. Otherwise such statements are
meaningless. Thus income, or output, or profits are concepts that make sense
only when a time period is specified. These are called flows because they occur
in a period of time. Therefore we need to delineate a time period to get a
quantitative measure of these. Since a lot of accounting is done annually in an
economy, many of these are expressed annually like annual profits or production.
Flows are defined over a period of time.
Reprint 2024-25
Page 4


National Income Accounting National Income Accounting National Income Accounting National Income Accounting National Income Accounting
In this chapter we will introduce the fundamental functioning of a
simple economy. In section 2.1 we describe some primary ideas
we shall work with. In section 2.2 we describe how we can view
the aggregate income of the entire economy going through the
sectors of the economy in a circular way. The same section also
deals with the three ways to calculate the national income; namely
product method, expenditure method and income method. The
last section 2.3 describes the various sub-categories of national
income. It also defines different price indices like GDP deflator,
Consumer Price Index, Wholesale Price Indices and discusses the
problems associated with taking GDP of a country as an indicator
of the aggregate welfare of the people of the country.
2.1 SOME BASIC CONCEPTS OF MACROECONOMICS
One of the pioneers of the subject we call in economics today,
Adam Smith, named his most influential work – An Enquiry into
the Nature and Cause of the Wealth of Nations. What generates
the economic wealth of a nation? What makes countries rich or
poor? These are some of the central questions of economics. It is
not that countries which are endowed with a bounty of natural
wealth – minerals or forests or the most fertile lands – are naturally
the richest countries. In fact the resource rich Africa and Latin
America have some of the poorest countries in the world, whereas
many prosperous countries have scarcely any natural wealth.
There was a time when possession of natural resources was the
most important consideration but even then the resource had to
be transformed through a production process.
The economic wealth, or well-being, of a country thus does
not necessarily depend on the mere possession of resources; the
point is how these resources are used in generating a flow of
production and how, as a  consequence, income and wealth are
generated from that process.
Let us now dwell upon this flow of production. How does this
flow of production arise? People combine their energies with
natural and manmade environment within a certain social and
technological structure to generate a flow of production.
In our modern economic setting this flow of production arises
out of production of commodities – goods and services by millions
of enterprises large and small. These enterprises range from giant
Reprint 2024-25
10 10 10 10 10
Introductory Macroeconomics
corporations employing a large number of people to single entrepreneur
enterprises. But what happens to these commodities after being produced? Each
producer of commodities intends to sell her output. So from the smallest items
like pins or buttons to the largest ones like aeroplanes, automobiles, giant
machinery or any saleable service like that of the doctor, the lawyer or the financial
consultant – the goods and services produced are to be sold to the consumers.
The consumer may, in turn, be an individual or an enterprise and the good or
service purchased by that entity might be for final use or for use in further
production. When it is used in further production it often loses its characteristic
as that specific good and is transformed through a productive process into
another good. Thus a farmer producing cotton sells it to a spinning mill where
the raw cotton undergoes transformation to yarn; the yarn is, in turn, sold to a
textile mill where, through the productive process, it is transformed into cloth;
the cloth is, in turn, transformed through another productive process into an
article of clothing which is then ready to be sold finally to the consumers for
final use. Such an item that is meant for final use and will not pass through any
more stages of production or transformations is called a final good.
Why do we call this a final good? Because once it has been sold it passes out
of the active economic flow. It will not undergo any further transformation at the
hands of any producer. It may, however, undergo transformation by the action
of the ultimate purchaser. In fact many such final goods are transformed during
their consumption. Thus the tea leaves purchased by the consumer are not
consumed in that form – they are used to make drinkable tea, which is consumed.
Similarly most of the items that enter our kitchen are transformed through the
process of cooking. But cooking at home is not an economic activity, even though
the product involved undergoes transformation. Home cooked food is not sold
to the market. However, if the same cooking or tea brewing was done in a
restaurant where the cooked product would be sold to customers, then the
same items, such as tea leaves, would cease to be final goods and would be
counted as inputs to which economic value addition can take place. Thus it is
not in the nature of the good but in the economic nature of its use that a good
becomes a final good.
Of the final goods, we can distinguish between consumption goods and
capital goods. Goods like food and clothing, and services like recreation that
are consumed when purchased by their ultimate consumers are called
consumption goods or consumer goods. (This also includes services which are
consumed but for convenience we may refer to them as consumer goods.)
Then there are other goods that are of durable character which are used in
the production process. These are tools, implements and machines. While they
make production of other commodities feasible, they themselves don’t get
transformed in the production process. They are also final goods yet they are
not final goods to be ultimately consumed. Unlike the final goods that we have
considered above, they are the crucial backbone of any production process, in
aiding and enabling the production to take place. These goods form a part of
capital, one of the crucial factors of production in which a productive enterprise
has invested, and they continue to enable the production process to go on for
continuous cycles of production. These are capital goods and they gradually
undergo wear and tear, and thus are repaired or gradually replaced over time.
The stock of capital that an economy possesses is thus preserved, maintained
and renewed partially or wholly over time and this is of some importance in the
discussion that will follow.
Reprint 2024-25
11 11 11 11 11
National Income Accounting
We may note here that some commodities like television sets, automobiles
or home computers, although they are for ultimate consumption, have one
characteristic in common with capital goods – they are also durable. That is,
they are not extinguished by immediate or even short period consumption;
they have a relatively long life as compared to articles such as food or even
clothing. They also undergo wear and tear with gradual use and often need
repairs and replacements of parts, i.e., like machines they also need to be
preserved, maintained and renewed. That is why we call these goods
consumer durables.
Thus if we consider all the final goods and services produced in an economy
in a given period of time they are either in the form of consumption goods (both
durable and non-durable) or capital goods. As final goods they do not undergo
any further transformation in the economic process.
Of the total production taking place in the economy a large number of
products don’t end up in final consumption and are not capital goods either.
Such goods may be used by other producers as material inputs. Examples are
steel sheets used for making automobiles and copper used for making utensils.
These are intermediate goods, mostly used as raw material or inputs for
production of other commodities. These are not final goods.
Now, to have a comprehensive idea of the total flow of production in the
economy, we need to have a quantitative measure of the aggregate level of final
goods produced in the economy. However, in order to get a quantitative
assessment – a measure of the total final goods and services produced in the
economy – it is obvious that we need a common measuring rod. We cannot
add metres of cloth produced to tonnes of rice or number of automobiles or
machines. Our common measuring rod is money. Since each of these
commodities is produced for sale, the sum total of the monetary value of
these diverse commodities gives us a measure of final output. But why are
we to measure final goods only? Surely intermediate goods are crucial inputs
to any production process and a significant part of our manpower and capital
stock are engaged in production of these goods. However, since we are dealing
with value of output, we should realise that the value of the final goods already
includes the value of the intermediate goods that have entered into their
production as inputs. Counting them separately will lead to the error of double
counting. Whereas considering intermediate goods may give a fuller description
of total economic activity, counting them will highly exaggerate the final value
of our economic activity.
At this stage it is important to introduce the concepts of stocks and flows.
Often we hear statements like the average salary of someone is Rs 10,000 or the
output of the steel industry is so many tonnes or so many rupees in value. But
these are incomplete statements because it is not clear whether the income which
is being referred to is yearly or monthly or daily income and surely that makes
a huge difference. Sometimes, when the context is familiar, we assume that the
time period is known and therefore do not mention it. But inherent in all such
statements is a definite period of time. Otherwise such statements are
meaningless. Thus income, or output, or profits are concepts that make sense
only when a time period is specified. These are called flows because they occur
in a period of time. Therefore we need to delineate a time period to get a
quantitative measure of these. Since a lot of accounting is done annually in an
economy, many of these are expressed annually like annual profits or production.
Flows are defined over a period of time.
Reprint 2024-25
12 12 12 12 12
Introductory Macroeconomics
In contrast, capital goods or consumer durables once produced do not wear
out or get consumed in a delineated time period. In fact capital goods continue
to serve us through different cycles of production. The buildings or machines in
a factory are there irrespective of the specific time period. There can be addition
to, or deduction from, these if a new machine is added or a machine falls in
disuse and is not replaced. These are called stocks. Stocks are defined at a
particular point of time. However we can measure a change in stock over a
specific period of time like how many machines were added this year. Such
changes in stocks are thus flows, which can be measured over specific time
periods. A particular machine can be part of the capital stock for many years
(unless it wears out); but that machine can be part of the flow of new machines
added to the capital stock only for a single year when it was initially installed.
To further understand the difference between stock variables and flow
variables, let us take the following example. Suppose a tank is being filled with
water coming from a tap. The amount of water which is flowing into the tank
from the tap per minute is a flow. But how much water there is in the tank at a
particular point of time is a stock concept.
To come back to our discussion on the measure of final output, that part
of our final output that comprises of capital goods constitutes gross
investment of an economy
1
. These may be machines, tools and implements;
buildings, office spaces, storehouses or infrastructure like roads, bridges,
airports or jetties. But all the capital goods produced in a year do not
constitute an addition to the capital stock already existing. A significant part
of current output of capital goods goes in maintaining or replacing part of
the existing stock of capital goods. This is because the already existing capital
stock suffers wear and tear and needs maintenance and replacement. A part
of the capital goods produced this year goes for replacement of existing capital
goods and is not an addition to the stock of capital goods already existing
and its value needs to be subtracted from gross investment for arriving at the
measure for net investment. This deletion, which is made from the value of
gross investment in order to accommodate regular wear and tear of capital,
is called depreciation.
So new addition to capital stock in an economy is measured by net investment
or new capital formation, which is expressed as
Net Investment = Gross investment – Depreciation
Let us examine this concept called depreciation a little more in detail. Let us
consider a new machine that a firm invests in. This machine may be in service for
the next twenty years after which it falls into disrepair and needs to be replaced.
We can now imagine as if the machine is being gradually used up in each year’s
production process and each year one twentieth of its original value is getting
depreciated. So, instead of considering a bulk investment for replacement after
twenty years, we consider an annual depreciation cost every year. This is the
usual sense in which the term depreciation is used and inherent in its conception
is the expected life of a particular capital good, like twenty years in our example of
the machine. Depreciation is thus an annual allowance for wear and tear of a
1
This is how economists define investment. This must not be confused with the commonplace
notion of investment which implies using money to buy physical or financial assets. Thus use of the
term investment to denote purchase of shares or property or even having an insurance policy has
nothing to do with how economists define investment. Investment for us is always capital formation,
a gross or net addition to capital stock.
Reprint 2024-25
Page 5


National Income Accounting National Income Accounting National Income Accounting National Income Accounting National Income Accounting
In this chapter we will introduce the fundamental functioning of a
simple economy. In section 2.1 we describe some primary ideas
we shall work with. In section 2.2 we describe how we can view
the aggregate income of the entire economy going through the
sectors of the economy in a circular way. The same section also
deals with the three ways to calculate the national income; namely
product method, expenditure method and income method. The
last section 2.3 describes the various sub-categories of national
income. It also defines different price indices like GDP deflator,
Consumer Price Index, Wholesale Price Indices and discusses the
problems associated with taking GDP of a country as an indicator
of the aggregate welfare of the people of the country.
2.1 SOME BASIC CONCEPTS OF MACROECONOMICS
One of the pioneers of the subject we call in economics today,
Adam Smith, named his most influential work – An Enquiry into
the Nature and Cause of the Wealth of Nations. What generates
the economic wealth of a nation? What makes countries rich or
poor? These are some of the central questions of economics. It is
not that countries which are endowed with a bounty of natural
wealth – minerals or forests or the most fertile lands – are naturally
the richest countries. In fact the resource rich Africa and Latin
America have some of the poorest countries in the world, whereas
many prosperous countries have scarcely any natural wealth.
There was a time when possession of natural resources was the
most important consideration but even then the resource had to
be transformed through a production process.
The economic wealth, or well-being, of a country thus does
not necessarily depend on the mere possession of resources; the
point is how these resources are used in generating a flow of
production and how, as a  consequence, income and wealth are
generated from that process.
Let us now dwell upon this flow of production. How does this
flow of production arise? People combine their energies with
natural and manmade environment within a certain social and
technological structure to generate a flow of production.
In our modern economic setting this flow of production arises
out of production of commodities – goods and services by millions
of enterprises large and small. These enterprises range from giant
Reprint 2024-25
10 10 10 10 10
Introductory Macroeconomics
corporations employing a large number of people to single entrepreneur
enterprises. But what happens to these commodities after being produced? Each
producer of commodities intends to sell her output. So from the smallest items
like pins or buttons to the largest ones like aeroplanes, automobiles, giant
machinery or any saleable service like that of the doctor, the lawyer or the financial
consultant – the goods and services produced are to be sold to the consumers.
The consumer may, in turn, be an individual or an enterprise and the good or
service purchased by that entity might be for final use or for use in further
production. When it is used in further production it often loses its characteristic
as that specific good and is transformed through a productive process into
another good. Thus a farmer producing cotton sells it to a spinning mill where
the raw cotton undergoes transformation to yarn; the yarn is, in turn, sold to a
textile mill where, through the productive process, it is transformed into cloth;
the cloth is, in turn, transformed through another productive process into an
article of clothing which is then ready to be sold finally to the consumers for
final use. Such an item that is meant for final use and will not pass through any
more stages of production or transformations is called a final good.
Why do we call this a final good? Because once it has been sold it passes out
of the active economic flow. It will not undergo any further transformation at the
hands of any producer. It may, however, undergo transformation by the action
of the ultimate purchaser. In fact many such final goods are transformed during
their consumption. Thus the tea leaves purchased by the consumer are not
consumed in that form – they are used to make drinkable tea, which is consumed.
Similarly most of the items that enter our kitchen are transformed through the
process of cooking. But cooking at home is not an economic activity, even though
the product involved undergoes transformation. Home cooked food is not sold
to the market. However, if the same cooking or tea brewing was done in a
restaurant where the cooked product would be sold to customers, then the
same items, such as tea leaves, would cease to be final goods and would be
counted as inputs to which economic value addition can take place. Thus it is
not in the nature of the good but in the economic nature of its use that a good
becomes a final good.
Of the final goods, we can distinguish between consumption goods and
capital goods. Goods like food and clothing, and services like recreation that
are consumed when purchased by their ultimate consumers are called
consumption goods or consumer goods. (This also includes services which are
consumed but for convenience we may refer to them as consumer goods.)
Then there are other goods that are of durable character which are used in
the production process. These are tools, implements and machines. While they
make production of other commodities feasible, they themselves don’t get
transformed in the production process. They are also final goods yet they are
not final goods to be ultimately consumed. Unlike the final goods that we have
considered above, they are the crucial backbone of any production process, in
aiding and enabling the production to take place. These goods form a part of
capital, one of the crucial factors of production in which a productive enterprise
has invested, and they continue to enable the production process to go on for
continuous cycles of production. These are capital goods and they gradually
undergo wear and tear, and thus are repaired or gradually replaced over time.
The stock of capital that an economy possesses is thus preserved, maintained
and renewed partially or wholly over time and this is of some importance in the
discussion that will follow.
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National Income Accounting
We may note here that some commodities like television sets, automobiles
or home computers, although they are for ultimate consumption, have one
characteristic in common with capital goods – they are also durable. That is,
they are not extinguished by immediate or even short period consumption;
they have a relatively long life as compared to articles such as food or even
clothing. They also undergo wear and tear with gradual use and often need
repairs and replacements of parts, i.e., like machines they also need to be
preserved, maintained and renewed. That is why we call these goods
consumer durables.
Thus if we consider all the final goods and services produced in an economy
in a given period of time they are either in the form of consumption goods (both
durable and non-durable) or capital goods. As final goods they do not undergo
any further transformation in the economic process.
Of the total production taking place in the economy a large number of
products don’t end up in final consumption and are not capital goods either.
Such goods may be used by other producers as material inputs. Examples are
steel sheets used for making automobiles and copper used for making utensils.
These are intermediate goods, mostly used as raw material or inputs for
production of other commodities. These are not final goods.
Now, to have a comprehensive idea of the total flow of production in the
economy, we need to have a quantitative measure of the aggregate level of final
goods produced in the economy. However, in order to get a quantitative
assessment – a measure of the total final goods and services produced in the
economy – it is obvious that we need a common measuring rod. We cannot
add metres of cloth produced to tonnes of rice or number of automobiles or
machines. Our common measuring rod is money. Since each of these
commodities is produced for sale, the sum total of the monetary value of
these diverse commodities gives us a measure of final output. But why are
we to measure final goods only? Surely intermediate goods are crucial inputs
to any production process and a significant part of our manpower and capital
stock are engaged in production of these goods. However, since we are dealing
with value of output, we should realise that the value of the final goods already
includes the value of the intermediate goods that have entered into their
production as inputs. Counting them separately will lead to the error of double
counting. Whereas considering intermediate goods may give a fuller description
of total economic activity, counting them will highly exaggerate the final value
of our economic activity.
At this stage it is important to introduce the concepts of stocks and flows.
Often we hear statements like the average salary of someone is Rs 10,000 or the
output of the steel industry is so many tonnes or so many rupees in value. But
these are incomplete statements because it is not clear whether the income which
is being referred to is yearly or monthly or daily income and surely that makes
a huge difference. Sometimes, when the context is familiar, we assume that the
time period is known and therefore do not mention it. But inherent in all such
statements is a definite period of time. Otherwise such statements are
meaningless. Thus income, or output, or profits are concepts that make sense
only when a time period is specified. These are called flows because they occur
in a period of time. Therefore we need to delineate a time period to get a
quantitative measure of these. Since a lot of accounting is done annually in an
economy, many of these are expressed annually like annual profits or production.
Flows are defined over a period of time.
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Introductory Macroeconomics
In contrast, capital goods or consumer durables once produced do not wear
out or get consumed in a delineated time period. In fact capital goods continue
to serve us through different cycles of production. The buildings or machines in
a factory are there irrespective of the specific time period. There can be addition
to, or deduction from, these if a new machine is added or a machine falls in
disuse and is not replaced. These are called stocks. Stocks are defined at a
particular point of time. However we can measure a change in stock over a
specific period of time like how many machines were added this year. Such
changes in stocks are thus flows, which can be measured over specific time
periods. A particular machine can be part of the capital stock for many years
(unless it wears out); but that machine can be part of the flow of new machines
added to the capital stock only for a single year when it was initially installed.
To further understand the difference between stock variables and flow
variables, let us take the following example. Suppose a tank is being filled with
water coming from a tap. The amount of water which is flowing into the tank
from the tap per minute is a flow. But how much water there is in the tank at a
particular point of time is a stock concept.
To come back to our discussion on the measure of final output, that part
of our final output that comprises of capital goods constitutes gross
investment of an economy
1
. These may be machines, tools and implements;
buildings, office spaces, storehouses or infrastructure like roads, bridges,
airports or jetties. But all the capital goods produced in a year do not
constitute an addition to the capital stock already existing. A significant part
of current output of capital goods goes in maintaining or replacing part of
the existing stock of capital goods. This is because the already existing capital
stock suffers wear and tear and needs maintenance and replacement. A part
of the capital goods produced this year goes for replacement of existing capital
goods and is not an addition to the stock of capital goods already existing
and its value needs to be subtracted from gross investment for arriving at the
measure for net investment. This deletion, which is made from the value of
gross investment in order to accommodate regular wear and tear of capital,
is called depreciation.
So new addition to capital stock in an economy is measured by net investment
or new capital formation, which is expressed as
Net Investment = Gross investment – Depreciation
Let us examine this concept called depreciation a little more in detail. Let us
consider a new machine that a firm invests in. This machine may be in service for
the next twenty years after which it falls into disrepair and needs to be replaced.
We can now imagine as if the machine is being gradually used up in each year’s
production process and each year one twentieth of its original value is getting
depreciated. So, instead of considering a bulk investment for replacement after
twenty years, we consider an annual depreciation cost every year. This is the
usual sense in which the term depreciation is used and inherent in its conception
is the expected life of a particular capital good, like twenty years in our example of
the machine. Depreciation is thus an annual allowance for wear and tear of a
1
This is how economists define investment. This must not be confused with the commonplace
notion of investment which implies using money to buy physical or financial assets. Thus use of the
term investment to denote purchase of shares or property or even having an insurance policy has
nothing to do with how economists define investment. Investment for us is always capital formation,
a gross or net addition to capital stock.
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National Income Accounting
capital good.
2
 In other words it is the cost of the good divided by number of years
of its useful life.
3
Notice here that depreciation is an accounting concept. No real expenditure
may have actually been incurred each year yet depreciation is annually
accounted for. In an economy with thousands of enterprises with widely varying
periods of life of their equipment, in any particular year, some enterprises are
actually making the bulk replacement spending. Thus, we can realistically
assume that there will be a steady flow of actual replacement spending which
will more or less match the amount of annual depreciation being accounted
for in that economy.
Now if we go back to our discussion of total final output produced in an
economy, we see that there is output of consumer goods and services and
output of capital goods. The consumer goods sustain the consumption of
the entire population of the economy. Purchase of consumer goods depends
on the capacity of the people to spend on these goods which, in turn, depends
on their income. The other part of the final goods, the capital goods, are
purchased by business enterprises. They are used either for maintenance of
the capital stock because there are wear and tear of it, or they are used for
addition to their capital stock. In a specific time period, say in a year, thetotal
production of final goods can thus be either in the form of consumption or
investment. This implies that there is a trade-off. If an economy, produces
more of consumer goods, it is producing less of capital goods and vice-
versa.
It is generally observed that more sophisticated and heavy capital goods
raise the ability of a labourer to produce goods. The traditional weaver would
take months to weave a sari but with modern machinery thousands of pieces of
clothing are produced in a day. Decades were taken to construct the great
historical monuments like the Pyramids or the Taj Mahal but with modern
construction machinery one can build a skyscraper in a few years. More
production of newer varities of capital goods therefore would help in the greater
production of consumer goods.
But aren’t we contradicting ourselves? Earlier we have seen how, of the total
output of final goods of an economy, if a larger share goes for production of
capital goods, a smaller share is available for production of consumer goods.
And now we are saving more capital goods would mean more consumer goods.
There is no contradiction here however. What is important here is the element of
time. At a particular period, given a level of total output of the economy, it is
true if more capital goods are produced less of consumer goods would be
produced. But production of more capital goods would mean that in future the
labourers would have more capital equipments to work with. We have seen that
this leads to a higher capacity of the economy to produce with the same number
of labourers. Thus total input itself would be higher compared to the case when
less capital goods were produced. If total output is higher the amount of
consumer goods that can be produced would surely be higher.
  2
Depreciation does not take into account unexpected or sudden destruction or disuse of
capital as can happen with accidents, natural calamities or other such extraneous circumstances.
 3
We are making a rather simple assumption here that there is a constant rate of depreciation
based on the original value of the asset. There can be other methods to calculate depreciation in
actual practice.
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