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86 
 
Unit VIII: Determination of Income and Employment 
 
Key concepts 
 Aggregate demand and its components. 
 Propensity to consume and propensity to save 
 Short run fixed price in product market equilibrium output, investment or output 
multiplier and the multiplier mechanism. 
 Meaning of full employment and involuntary unemployment. 
 Problems of excess demand and deficient demand. 
 Measures to correct excess demand and deficient demand. 
 Change in government spending. 
 Availability of credit. 
 Autonomous consumption: The consumption which does not depend upon income. 
(Or) The amount of consumption expenditure when income is zero. C > 0. Even if 
income is zero consumption cannot be zero. Consumption will take place from past 
savings for survival.  
 Autonomous Investments: It is Investment which is made irrespective of level of 
income. It is generally run by the government sector. It is income inelastic. The 
volume of autonomous investment is same at all level of income.  
Key points 
 Determination of income, output and employment is the core of the subject matter of 
macroeconomics. 
 AD and AS together determine the level of income, output and employment. 
 Aggregate demand is the total demand of goods and service in the economy. 
 The main components of AD are- 
1. House hold consumption expenditure. 
2. Investment expenditure. 
3. Government consumption expenditure 
4. Net export. 
 Household consumption expenditure is the expenditure incurred by the household 
on the purchase of goods and services to satisfy their wants. 
 Investment expenditure refers to the expenditure incurred by the private firms and 
government on the purchase of capital goods such as plant and equipment. 
 Government consumption expenditure refers to the expenditure incurred by the 
government on the purchase of goods and services. 
 Net export refers to the difference between export and import. 
 AD=C+I+G+(x-m). 
 In a two sector economy AD =C+I. 
 Aggregate supply is the sum total of consumption expenditure and saving. 
AS=C+S 
PROPENSITY TO CONSUME AND PROPENSITY TO SAVE. 
 The relationship between consumption and income is called propensity to consume or 
consumption function. 
Page 2


 
 
86 
 
Unit VIII: Determination of Income and Employment 
 
Key concepts 
 Aggregate demand and its components. 
 Propensity to consume and propensity to save 
 Short run fixed price in product market equilibrium output, investment or output 
multiplier and the multiplier mechanism. 
 Meaning of full employment and involuntary unemployment. 
 Problems of excess demand and deficient demand. 
 Measures to correct excess demand and deficient demand. 
 Change in government spending. 
 Availability of credit. 
 Autonomous consumption: The consumption which does not depend upon income. 
(Or) The amount of consumption expenditure when income is zero. C > 0. Even if 
income is zero consumption cannot be zero. Consumption will take place from past 
savings for survival.  
 Autonomous Investments: It is Investment which is made irrespective of level of 
income. It is generally run by the government sector. It is income inelastic. The 
volume of autonomous investment is same at all level of income.  
Key points 
 Determination of income, output and employment is the core of the subject matter of 
macroeconomics. 
 AD and AS together determine the level of income, output and employment. 
 Aggregate demand is the total demand of goods and service in the economy. 
 The main components of AD are- 
1. House hold consumption expenditure. 
2. Investment expenditure. 
3. Government consumption expenditure 
4. Net export. 
 Household consumption expenditure is the expenditure incurred by the household 
on the purchase of goods and services to satisfy their wants. 
 Investment expenditure refers to the expenditure incurred by the private firms and 
government on the purchase of capital goods such as plant and equipment. 
 Government consumption expenditure refers to the expenditure incurred by the 
government on the purchase of goods and services. 
 Net export refers to the difference between export and import. 
 AD=C+I+G+(x-m). 
 In a two sector economy AD =C+I. 
 Aggregate supply is the sum total of consumption expenditure and saving. 
AS=C+S 
PROPENSITY TO CONSUME AND PROPENSITY TO SAVE. 
 The relationship between consumption and income is called propensity to consume or 
consumption function. 
 
 
87 
 
1. C=f(Y). 
 Consumption function may be represented by an equation. 
C=a+b(Y)            
C=consumption, a =consumption at zero level of income b=MPC (slope of the 
consumption curve) Y=income. 
The consumption equation shows the level of consumption for various level of 
income. 
 Propensity to consume is of two types  
A) Average propensity to consume (APC) 
B) Marginal propensity to consume (MPC). 
 APC= ratio of total consumption to total income. 
APC=C/Y. 
 MPC=?C/?Y. 
 Propensity to save indicates the tendency of the households to save at a given level of 
income. It shows the relation between saving and income.  
 Propensity to save is also of two types. 
A. Average propensity to save (APC) 
B. Marginal propensity to save.(MPC) 
 Average propensity to save is the ratio of saving to income  
APC=S/Y. 
 Marginal propensity to save is the ratio of change in saving to change in income 
MPS=?S/?Y. 
 There is relationship between APC and APS. 
APC+APS=1 
APC=1-APS. 
 There is relationship between MPC and MPS. 
MPC+MPS=1 
1-MPC=MPS. 
Meaning of involuntary unemployment and full employment. 
 Involuntary unemployment refers to a situation in which people are ready to work at 
prevailing wage rate, but do not find work. 
 Full employment refers to a situation in which no one is unemployed i.e.…there is no 
involuntary unemployment. 
 According to Keynes full employment signifies a level of employment where increase 
in aggregate demand does not lead to an increase in the level of output and 
employment. 
Increase in demand beyond full employment causes prices to go up. 
 
DETERMINATION OF INCOME AND EMPLOYMENT. 
 The determination of income and employment in the Keynesian theory depends on the 
level of AD and AS. 
 Equilibrium level of income and output is determined where, 
1) AD=AS 2) Planned saving =planned investment.                                                                                       
Page 3


 
 
86 
 
Unit VIII: Determination of Income and Employment 
 
Key concepts 
 Aggregate demand and its components. 
 Propensity to consume and propensity to save 
 Short run fixed price in product market equilibrium output, investment or output 
multiplier and the multiplier mechanism. 
 Meaning of full employment and involuntary unemployment. 
 Problems of excess demand and deficient demand. 
 Measures to correct excess demand and deficient demand. 
 Change in government spending. 
 Availability of credit. 
 Autonomous consumption: The consumption which does not depend upon income. 
(Or) The amount of consumption expenditure when income is zero. C > 0. Even if 
income is zero consumption cannot be zero. Consumption will take place from past 
savings for survival.  
 Autonomous Investments: It is Investment which is made irrespective of level of 
income. It is generally run by the government sector. It is income inelastic. The 
volume of autonomous investment is same at all level of income.  
Key points 
 Determination of income, output and employment is the core of the subject matter of 
macroeconomics. 
 AD and AS together determine the level of income, output and employment. 
 Aggregate demand is the total demand of goods and service in the economy. 
 The main components of AD are- 
1. House hold consumption expenditure. 
2. Investment expenditure. 
3. Government consumption expenditure 
4. Net export. 
 Household consumption expenditure is the expenditure incurred by the household 
on the purchase of goods and services to satisfy their wants. 
 Investment expenditure refers to the expenditure incurred by the private firms and 
government on the purchase of capital goods such as plant and equipment. 
 Government consumption expenditure refers to the expenditure incurred by the 
government on the purchase of goods and services. 
 Net export refers to the difference between export and import. 
 AD=C+I+G+(x-m). 
 In a two sector economy AD =C+I. 
 Aggregate supply is the sum total of consumption expenditure and saving. 
AS=C+S 
PROPENSITY TO CONSUME AND PROPENSITY TO SAVE. 
 The relationship between consumption and income is called propensity to consume or 
consumption function. 
 
 
87 
 
1. C=f(Y). 
 Consumption function may be represented by an equation. 
C=a+b(Y)            
C=consumption, a =consumption at zero level of income b=MPC (slope of the 
consumption curve) Y=income. 
The consumption equation shows the level of consumption for various level of 
income. 
 Propensity to consume is of two types  
A) Average propensity to consume (APC) 
B) Marginal propensity to consume (MPC). 
 APC= ratio of total consumption to total income. 
APC=C/Y. 
 MPC=?C/?Y. 
 Propensity to save indicates the tendency of the households to save at a given level of 
income. It shows the relation between saving and income.  
 Propensity to save is also of two types. 
A. Average propensity to save (APC) 
B. Marginal propensity to save.(MPC) 
 Average propensity to save is the ratio of saving to income  
APC=S/Y. 
 Marginal propensity to save is the ratio of change in saving to change in income 
MPS=?S/?Y. 
 There is relationship between APC and APS. 
APC+APS=1 
APC=1-APS. 
 There is relationship between MPC and MPS. 
MPC+MPS=1 
1-MPC=MPS. 
Meaning of involuntary unemployment and full employment. 
 Involuntary unemployment refers to a situation in which people are ready to work at 
prevailing wage rate, but do not find work. 
 Full employment refers to a situation in which no one is unemployed i.e.…there is no 
involuntary unemployment. 
 According to Keynes full employment signifies a level of employment where increase 
in aggregate demand does not lead to an increase in the level of output and 
employment. 
Increase in demand beyond full employment causes prices to go up. 
 
DETERMINATION OF INCOME AND EMPLOYMENT. 
 The determination of income and employment in the Keynesian theory depends on the 
level of AD and AS. 
 Equilibrium level of income and output is determined where, 
1) AD=AS 2) Planned saving =planned investment.                                                                                       
 
 
88 
 
 In a two sector economy Ad=C+I, AS=Y, Y=C+I. 
 Suppose that C=40+0.75Y(CONSUMPTION FUNCTION) and I =Rs.60 (investment 
function)then the equilibrium level of income is obtained as  
Y=C+I 
Y=40+0.75Y=60 
Y-0.75Y=100 
0.25Y=100 
Y=10000/25 
Y=400crores. 
 Investment multipliers and its working. 
 Investment multiplier explains the relationship between increase in investment and the 
resultant increase in income. 
 Investment multiplier is the ratio of change in income to change in investment. 
Multiplier (k) =?y/?I. 
 The value of multiplier depends on the value of marginal propensity to consume 
(MPC). 
 There is direct relationship between k and MPC. 
 Multiplier also depends on the marginal propensity to save 
 There is inverse relationship between multiplier and MPS. 
 
 
IMPORTANT FORMULAE. 
 AD=C+I (two sector economy). 
 APC=C/Y. 
 APS=S/Y. 
 APC+APS=1 
 MPC=?C/?Y 
 MPS=?S/?Y 
 MPS+MPC=1 AND 1-MPC=MPS 
 K=?Y/?C or K=1/MPS or K=I/I-MPC 
 C= ¯c+b(Y) 
 S= -a+(1-b)Y 
¯c= autonomous consumption 
-a= negative saving 
(1-b)=MPS 
 
SHORT RUN FIXED PRICE ANALYSIS 
Basic Concept 
Assumption 
1) Fixed Price : 
Page 4


 
 
86 
 
Unit VIII: Determination of Income and Employment 
 
Key concepts 
 Aggregate demand and its components. 
 Propensity to consume and propensity to save 
 Short run fixed price in product market equilibrium output, investment or output 
multiplier and the multiplier mechanism. 
 Meaning of full employment and involuntary unemployment. 
 Problems of excess demand and deficient demand. 
 Measures to correct excess demand and deficient demand. 
 Change in government spending. 
 Availability of credit. 
 Autonomous consumption: The consumption which does not depend upon income. 
(Or) The amount of consumption expenditure when income is zero. C > 0. Even if 
income is zero consumption cannot be zero. Consumption will take place from past 
savings for survival.  
 Autonomous Investments: It is Investment which is made irrespective of level of 
income. It is generally run by the government sector. It is income inelastic. The 
volume of autonomous investment is same at all level of income.  
Key points 
 Determination of income, output and employment is the core of the subject matter of 
macroeconomics. 
 AD and AS together determine the level of income, output and employment. 
 Aggregate demand is the total demand of goods and service in the economy. 
 The main components of AD are- 
1. House hold consumption expenditure. 
2. Investment expenditure. 
3. Government consumption expenditure 
4. Net export. 
 Household consumption expenditure is the expenditure incurred by the household 
on the purchase of goods and services to satisfy their wants. 
 Investment expenditure refers to the expenditure incurred by the private firms and 
government on the purchase of capital goods such as plant and equipment. 
 Government consumption expenditure refers to the expenditure incurred by the 
government on the purchase of goods and services. 
 Net export refers to the difference between export and import. 
 AD=C+I+G+(x-m). 
 In a two sector economy AD =C+I. 
 Aggregate supply is the sum total of consumption expenditure and saving. 
AS=C+S 
PROPENSITY TO CONSUME AND PROPENSITY TO SAVE. 
 The relationship between consumption and income is called propensity to consume or 
consumption function. 
 
 
87 
 
1. C=f(Y). 
 Consumption function may be represented by an equation. 
C=a+b(Y)            
C=consumption, a =consumption at zero level of income b=MPC (slope of the 
consumption curve) Y=income. 
The consumption equation shows the level of consumption for various level of 
income. 
 Propensity to consume is of two types  
A) Average propensity to consume (APC) 
B) Marginal propensity to consume (MPC). 
 APC= ratio of total consumption to total income. 
APC=C/Y. 
 MPC=?C/?Y. 
 Propensity to save indicates the tendency of the households to save at a given level of 
income. It shows the relation between saving and income.  
 Propensity to save is also of two types. 
A. Average propensity to save (APC) 
B. Marginal propensity to save.(MPC) 
 Average propensity to save is the ratio of saving to income  
APC=S/Y. 
 Marginal propensity to save is the ratio of change in saving to change in income 
MPS=?S/?Y. 
 There is relationship between APC and APS. 
APC+APS=1 
APC=1-APS. 
 There is relationship between MPC and MPS. 
MPC+MPS=1 
1-MPC=MPS. 
Meaning of involuntary unemployment and full employment. 
 Involuntary unemployment refers to a situation in which people are ready to work at 
prevailing wage rate, but do not find work. 
 Full employment refers to a situation in which no one is unemployed i.e.…there is no 
involuntary unemployment. 
 According to Keynes full employment signifies a level of employment where increase 
in aggregate demand does not lead to an increase in the level of output and 
employment. 
Increase in demand beyond full employment causes prices to go up. 
 
DETERMINATION OF INCOME AND EMPLOYMENT. 
 The determination of income and employment in the Keynesian theory depends on the 
level of AD and AS. 
 Equilibrium level of income and output is determined where, 
1) AD=AS 2) Planned saving =planned investment.                                                                                       
 
 
88 
 
 In a two sector economy Ad=C+I, AS=Y, Y=C+I. 
 Suppose that C=40+0.75Y(CONSUMPTION FUNCTION) and I =Rs.60 (investment 
function)then the equilibrium level of income is obtained as  
Y=C+I 
Y=40+0.75Y=60 
Y-0.75Y=100 
0.25Y=100 
Y=10000/25 
Y=400crores. 
 Investment multipliers and its working. 
 Investment multiplier explains the relationship between increase in investment and the 
resultant increase in income. 
 Investment multiplier is the ratio of change in income to change in investment. 
Multiplier (k) =?y/?I. 
 The value of multiplier depends on the value of marginal propensity to consume 
(MPC). 
 There is direct relationship between k and MPC. 
 Multiplier also depends on the marginal propensity to save 
 There is inverse relationship between multiplier and MPS. 
 
 
IMPORTANT FORMULAE. 
 AD=C+I (two sector economy). 
 APC=C/Y. 
 APS=S/Y. 
 APC+APS=1 
 MPC=?C/?Y 
 MPS=?S/?Y 
 MPS+MPC=1 AND 1-MPC=MPS 
 K=?Y/?C or K=1/MPS or K=I/I-MPC 
 C= ¯c+b(Y) 
 S= -a+(1-b)Y 
¯c= autonomous consumption 
-a= negative saving 
(1-b)=MPS 
 
SHORT RUN FIXED PRICE ANALYSIS 
Basic Concept 
Assumption 
1) Fixed Price : 
 
 
89 
 
In the short period price is fixed (constant) and elasticity of supply is infinite i.e., supply 
curve is perfectly elastic. It means the suppliers are willing to supply whatever amount of 
goods, consumer will demand at that price.  
2) Fixed Interest Rate : Interest rate remains constant. 
3) Aggregate supply is perfectly elastic at this price.  
Under these circumstances equilibrium output will be determined by aggregate demand at 
this price in the economy. At a fixed price the value of ex-ante aggregate demand for final 
goods is the sum of ex-ante consumption expenditure C and ex-ante investment expenditure I 
on final goods. 
AD=C+I  
  Consumption function C =¯c + b(Y)  
¯c = Autonomous consumption  
b= marginal propensity to consume due to unit increase in income  
In the short period, price and rate of interest remaining constant i.e., ex-ante Investment 
expenditure is uniform i.e. same amount every year.  
                     Hence,                I      =    I 
I = Autonomous Expenditure 
we also assume that Aggregate Supply at this cost price is determined by aggregate demand 
which is known as Effective demand principle. The level of AD required to achieve full 
employment equilibrium is called effective demand. (or) AD at the point of equilibrium is 
called Effective demand.  
AD = C+I (By substituting the value of consumption function)  
        ?   ? 
AD = C + I + bY  
When final good market is in equilibrium, quantity demanded = quantity supplied  
AD = AS  
      ?   ? 
Y = C + I + by  
      ?      ?    ?   ? 
Y = A + bY (A = C + I   showing total autonomous expenditure  
             ? 
Y – bY = A 
                 ? 
Y(l – b) = A 
      ? 
Y = A /l - b  
                 __  __       _ 
Page 5


 
 
86 
 
Unit VIII: Determination of Income and Employment 
 
Key concepts 
 Aggregate demand and its components. 
 Propensity to consume and propensity to save 
 Short run fixed price in product market equilibrium output, investment or output 
multiplier and the multiplier mechanism. 
 Meaning of full employment and involuntary unemployment. 
 Problems of excess demand and deficient demand. 
 Measures to correct excess demand and deficient demand. 
 Change in government spending. 
 Availability of credit. 
 Autonomous consumption: The consumption which does not depend upon income. 
(Or) The amount of consumption expenditure when income is zero. C > 0. Even if 
income is zero consumption cannot be zero. Consumption will take place from past 
savings for survival.  
 Autonomous Investments: It is Investment which is made irrespective of level of 
income. It is generally run by the government sector. It is income inelastic. The 
volume of autonomous investment is same at all level of income.  
Key points 
 Determination of income, output and employment is the core of the subject matter of 
macroeconomics. 
 AD and AS together determine the level of income, output and employment. 
 Aggregate demand is the total demand of goods and service in the economy. 
 The main components of AD are- 
1. House hold consumption expenditure. 
2. Investment expenditure. 
3. Government consumption expenditure 
4. Net export. 
 Household consumption expenditure is the expenditure incurred by the household 
on the purchase of goods and services to satisfy their wants. 
 Investment expenditure refers to the expenditure incurred by the private firms and 
government on the purchase of capital goods such as plant and equipment. 
 Government consumption expenditure refers to the expenditure incurred by the 
government on the purchase of goods and services. 
 Net export refers to the difference between export and import. 
 AD=C+I+G+(x-m). 
 In a two sector economy AD =C+I. 
 Aggregate supply is the sum total of consumption expenditure and saving. 
AS=C+S 
PROPENSITY TO CONSUME AND PROPENSITY TO SAVE. 
 The relationship between consumption and income is called propensity to consume or 
consumption function. 
 
 
87 
 
1. C=f(Y). 
 Consumption function may be represented by an equation. 
C=a+b(Y)            
C=consumption, a =consumption at zero level of income b=MPC (slope of the 
consumption curve) Y=income. 
The consumption equation shows the level of consumption for various level of 
income. 
 Propensity to consume is of two types  
A) Average propensity to consume (APC) 
B) Marginal propensity to consume (MPC). 
 APC= ratio of total consumption to total income. 
APC=C/Y. 
 MPC=?C/?Y. 
 Propensity to save indicates the tendency of the households to save at a given level of 
income. It shows the relation between saving and income.  
 Propensity to save is also of two types. 
A. Average propensity to save (APC) 
B. Marginal propensity to save.(MPC) 
 Average propensity to save is the ratio of saving to income  
APC=S/Y. 
 Marginal propensity to save is the ratio of change in saving to change in income 
MPS=?S/?Y. 
 There is relationship between APC and APS. 
APC+APS=1 
APC=1-APS. 
 There is relationship between MPC and MPS. 
MPC+MPS=1 
1-MPC=MPS. 
Meaning of involuntary unemployment and full employment. 
 Involuntary unemployment refers to a situation in which people are ready to work at 
prevailing wage rate, but do not find work. 
 Full employment refers to a situation in which no one is unemployed i.e.…there is no 
involuntary unemployment. 
 According to Keynes full employment signifies a level of employment where increase 
in aggregate demand does not lead to an increase in the level of output and 
employment. 
Increase in demand beyond full employment causes prices to go up. 
 
DETERMINATION OF INCOME AND EMPLOYMENT. 
 The determination of income and employment in the Keynesian theory depends on the 
level of AD and AS. 
 Equilibrium level of income and output is determined where, 
1) AD=AS 2) Planned saving =planned investment.                                                                                       
 
 
88 
 
 In a two sector economy Ad=C+I, AS=Y, Y=C+I. 
 Suppose that C=40+0.75Y(CONSUMPTION FUNCTION) and I =Rs.60 (investment 
function)then the equilibrium level of income is obtained as  
Y=C+I 
Y=40+0.75Y=60 
Y-0.75Y=100 
0.25Y=100 
Y=10000/25 
Y=400crores. 
 Investment multipliers and its working. 
 Investment multiplier explains the relationship between increase in investment and the 
resultant increase in income. 
 Investment multiplier is the ratio of change in income to change in investment. 
Multiplier (k) =?y/?I. 
 The value of multiplier depends on the value of marginal propensity to consume 
(MPC). 
 There is direct relationship between k and MPC. 
 Multiplier also depends on the marginal propensity to save 
 There is inverse relationship between multiplier and MPS. 
 
 
IMPORTANT FORMULAE. 
 AD=C+I (two sector economy). 
 APC=C/Y. 
 APS=S/Y. 
 APC+APS=1 
 MPC=?C/?Y 
 MPS=?S/?Y 
 MPS+MPC=1 AND 1-MPC=MPS 
 K=?Y/?C or K=1/MPS or K=I/I-MPC 
 C= ¯c+b(Y) 
 S= -a+(1-b)Y 
¯c= autonomous consumption 
-a= negative saving 
(1-b)=MPS 
 
SHORT RUN FIXED PRICE ANALYSIS 
Basic Concept 
Assumption 
1) Fixed Price : 
 
 
89 
 
In the short period price is fixed (constant) and elasticity of supply is infinite i.e., supply 
curve is perfectly elastic. It means the suppliers are willing to supply whatever amount of 
goods, consumer will demand at that price.  
2) Fixed Interest Rate : Interest rate remains constant. 
3) Aggregate supply is perfectly elastic at this price.  
Under these circumstances equilibrium output will be determined by aggregate demand at 
this price in the economy. At a fixed price the value of ex-ante aggregate demand for final 
goods is the sum of ex-ante consumption expenditure C and ex-ante investment expenditure I 
on final goods. 
AD=C+I  
  Consumption function C =¯c + b(Y)  
¯c = Autonomous consumption  
b= marginal propensity to consume due to unit increase in income  
In the short period, price and rate of interest remaining constant i.e., ex-ante Investment 
expenditure is uniform i.e. same amount every year.  
                     Hence,                I      =    I 
I = Autonomous Expenditure 
we also assume that Aggregate Supply at this cost price is determined by aggregate demand 
which is known as Effective demand principle. The level of AD required to achieve full 
employment equilibrium is called effective demand. (or) AD at the point of equilibrium is 
called Effective demand.  
AD = C+I (By substituting the value of consumption function)  
        ?   ? 
AD = C + I + bY  
When final good market is in equilibrium, quantity demanded = quantity supplied  
AD = AS  
      ?   ? 
Y = C + I + by  
      ?      ?    ?   ? 
Y = A + bY (A = C + I   showing total autonomous expenditure  
             ? 
Y – bY = A 
                 ? 
Y(l – b) = A 
      ? 
Y = A /l - b  
                 __  __       _ 
 
 
90 
 
Y depends upon A   (C (or) I) or MPC. 
 
Effects of an autonomous change on equilibrium in the product market.  
 
 
The line AD1 and AD2 correspond to the values of A, via A1 and A2 respectively 
AS is the 45° line is equal to one  
The 45° line represents point at which AD and output are equal. 
The AD1 line intersects the 45° line at point E1.  
At equilibrium point the equilibrium values of output and aggregate demand are OY1 and 
AD1. 
When autonomous investment increases the AD1 line shifts upwards and assumes the 
position AD2.  
The value of aggregate demand at output OY1 is Y1F which is greater than the value of 
output OY1 = Y1E1 by an amount E1F  
• E1F measures the amount of excess demand that emerges in the economy as a result of the 
increase in autonomous expenditure: The new AD2 intersects the 45° line at point E2 at the 
new equilibrium output and AD2 have increased by an amount E2G which is greater than the 
initial increment in autonomous expenditure E1F.  
 
1 MARK QUESTIONS 
 
1. What is the relation between APC and APS? 
Ans. APC+APS=1 
AS=Y 
AD2=A2 + bY 
AD1=A1 + bY 
        Output 
 A1       
 A2       
    Y1       
 E1       
 F       
 E2       
 
G       
        Aggregate Demand 
O       
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FAQs on Determination of Income & Employment Notes - Class 12

1. What is the concept of income in economics?
Ans. Income in economics refers to the money or payment received by individuals or organizations in exchange for their productive activities or resources. It includes wages, salaries, profits, rent, interest, and any other form of monetary compensation.
2. How is income measured in an economy?
Ans. In an economy, income is measured through national income accounting methods. The most common method is the expenditure approach, where national income is calculated by adding up the total expenditures made by households, businesses, and the government. Another method is the income approach, which calculates national income by summing up the incomes earned by individuals and businesses.
3. What is the difference between gross income and net income?
Ans. Gross income refers to the total income earned by an individual or business before deducting any expenses or taxes. It represents the total revenue generated. On the other hand, net income is the income left after deducting all expenses and taxes from the gross income. It provides a more accurate measure of the actual income earned.
4. How does employment contribute to income generation?
Ans. Employment plays a crucial role in income generation as it provides individuals with opportunities to earn income through wages or salaries. When individuals are employed, they can utilize their skills and abilities to contribute to the production of goods and services, which in turn generates income for them. Additionally, employment also leads to increased consumption, further stimulating economic growth.
5. What are the factors that determine the level of income and employment in an economy?
Ans. The level of income and employment in an economy is determined by various factors, including aggregate demand, government policies, investment levels, technological advancements, labor market conditions, and consumer confidence. When aggregate demand is high, businesses tend to expand and hire more workers, leading to increased employment and income levels. Similarly, government policies and investment levels can also influence income and employment by creating a favorable business environment and promoting economic growth.
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