SSC CGL Exam  >  SSC CGL Notes  >  SSC CGL Tier 2 - Study Material, Online Tests, Previous Year  >  Chapter Notes - Cost Of Production

Cost Of Production Class 12 Economics

COST FUNCTION :: It studies the FUNCTIONAL RELATIONSHIP between output and cost of production. It tells the least cost combination of inputs for different levels of output C = f (Q) 

MEANING OF COST :: Ordinary, money expenditure incurred by a firm in production of a commodity is called the cost of production. A firm requires factor inputs  and non-factor inputs for producing a commodity and the firm pays them in the form of money e.g rent to the landlord, salaries and wages to the labour, interest to the capitalist and expenditure on other inputs like raw material, power, transportation, Insurance charges, etc.
These are costs to the firm and are called money costs because these are paid in the form of money.

⇒ But in economics, the concept ‘cost’ is used in a broader sense.In economics sum ofexplicit costs(accounting) and implicit costs (non-accounting)  constitute the total cost of production.

 

In SHORT PERIOD, costs can be categorised into fixed cost and variable cost, but in long period all cost are variable cost

B.O.DTOTAL FIXED COST (TFC)TOTAL VARIABLE COST (TVC)
MEANINGThese are those cost which donot changes with change in output i.e they remains constant at all level of output  Cost Of Production Class 12 Economics fixed cost remains constant.

These are those cost which changes with change in output . 

Cost Of Production Class 12 Economics

INCURRED
 ON
These are incurred on Fixed factor of productionThese are incurred on Variable factor of production
KNOWN AS

These cost are also known as

→ Supplement Cost    or
 → Overhead Cost      or
 → Indirect Cost            or
 → General Cost             or
 → Unavoidable cost         or

These cost are also known as

→ Prime  Cost  or
 → Direct Cost   or
 → Avoidable Cost

EXAMPLEExamples are Rent, Insurance premium , Cost of P & M,  Licence fee , Wages and Salaries of permanent staffExamples : Raw material like cotton for shirt, leather for shoes , Wages and Salary,Electricity , Fuel expenses
SITUATION
 OF ZERO
Fxed cost can never be zero. It is positive even at zero level of outputSuch cost are incurred till there is production and hence it becomes zero at zero level of output
CONTINU-
 ANCE
Production can be carried at the loss of fixed cost. Fixed cost is maximum loss a producer can suffer (borne)A producer must recover variable cost otherwise he will stop production
SHAPE

T.F.C curve is PARALLEL TO X-AXIS

Cost Of Production Class 12 Economics

Cost Of Production Class 12 Economics

It starts from origin and is  INVERSE S - SHAPED that is

→ Initially increases at a diminishingrate (due to increasing return to factor)
→  Then increases at a constant rate(due to constant return to factor)  
→Finally increases at increasingrate (due to decreasing return to factor

Cost Of Production Class 12 Economics

 

TOTAL COST  :: It is all the expenditure incurred in production of a commodity. It is summation of Total Fixed cost (TFC)  and Total Variable Cost (TVC)

TC = TFC + TVC
 TC =  ATC x Output


Cost Of Production Class 12 Economics

Cost Of Production Class 12 Economics

Cost Of Production Class 12 Economics

BEHAVIOUR OF TOTAL COST

(1) ZERO LEVEL OF OUTPUT :: At zero level of output Total fixed cost (TFC) is equal to Total Cost (TC) which means that total cost is positive even at zero level of output and thus TC curve starts from the point as intercept on Y-axis. 

(2) PARALLEL TO TVC :: The vertical distance between Total Cost (TC) and Total Variable Cost (TVC) on a graph is Total Fixed Cost (TFC) [ as TC - TVC = TFC].  

→ Since TFC is constant at all levels of output ,therefore the vertical distancebetween Total cost and Total variable cost will also be same which means that both becomes parallel lines.Thus The change in TC is entirely due to TVC as TFC is constant at all level of output.

(3) SHAPE :: Starts from intercept on Y-axis and is Inverse S-shaped. It means TC curve starts from origin and  

→  Initially increases at a diminishing rate
→  Then increases at a constant rate
→  Finally increases at increasing rate

MARGINAL COST :: It is ADDITIONAL COST incurred for PRODUCTION OF ADDITIONAL UNIT by  employing additional factor of production.

(1) MC CURVE IS U - SHAPED which means this cost initially decreases with increase in output but after reaching a certain point the cost starts increasing.

(2) MC is NOT AFFECTED BY FIXED COST as fixed cost remains constant for all level of output and can never be additional cost. Thus MC is affected by variable cost only that changes with change in output

Cost Of Production Class 12 Economics
Cost Of Production Class 12 Economics

RELATION BETWEEN TVC AND MC

MC refers to additional cost and additional cost can only be variable cost. Accordingly sum total of Marginal Cost at all level of output will be total variable cost and not total cost because total cost includes fixed cost i.e

MC = TVCn   - TVCn-1

Σ MC = TVC and Σ MC ≠ TC .


Cost Of Production Class 12 Economics

GRAPHICALLY

→ Up to point Q*, TVC is increasing at a decreasing rate,because MC is decreasing.  
→ Beyond point Q*, TVC is increasing at an increasing rate,because MC is increasing.  
→ At point Q*, TVC stops increasing at a decreasing rate,because MC touches its lowest point.  

It means that area under MC at any level of output isTotal variable cost (TVC). Thus if OB level of output is produced area OBCD will be equal to total variable cost 

Consider any level of output say six units at this level TVC = 48 which is summation of MC

Cost Of Production Class 12 Economics

AVERAGE CONCEPTS

(1) AVERAGE FIXED COST (AFC) :: It is PER UNIT FIXED COST of producing goods.

Cost Of Production Class 12 Economics

(2) AVERAGE VARIABLE COST (AVC) :: It is PER UNIT VARIABLE COST of producing goods

Cost Of Production Class 12 Economics

SHAPE :: U - Shaped

(3) AVERAGE TOTAL COST (ATC) or AVERAGE COST (AC) :: It is PER UNIT TOTAL COST of producing goods

Cost Of Production Class 12 Economics

AFC’S NATURE // PROPERTIES // CHARACTERISTIC

Cost Of Production Class 12 Economics

Cost Of Production Class 12 Economics

(1) AVERAGE FIXED COST (AFC) GOES ON DECREASING WITH INCREASE IN OUTPUT :: AFC is total fixed cost (TFC) divided by output and as the output is increased , the constant fixed cost gets distributed to increased number of output and this cause
Average fixed Cost (AFC) to decrease.
As depicted in the example as output is increased from 1unit to 2 unit the TFC (=20) gets distributed to 2 units and AFC becomes Rs10/- per unit

(2) AFC IS NEVER ZERO Therefore it never touches X-axis

(3) It assumes the SHAPE OF RECTANGULAR HYPERBOLA which means at any level of output area under the curve is same.
Area under the AFC curve represents AFC x Q which equals Total fixed Cost (TFC) and as we know TFC remains constant for all level of output , therefore Area at all points on rectangular hyperbola is same

At OB level of output ,  Area = OB x OC = 2 x 10 = 20
 At OD level of output ,  Area =  OD x OE = 4 x 5  = 20

RELATIONSHIP BETWEEN AVERAGE TOTAL COST (ATC) WITH MARGINAL COST (MC)

Note :: It is MC which brings about changes (rise or fall) in AC and not the other way round.

(1) Both are derived from Total Cost as Ac = TC/Q and  MC = TCN - TCN-1

(2) W hen AC is falling , MC is below it (as MC declines faster than AC) 

AC > MC

(3) W hen AC is rising , MC is above it (as MC rises faster than AC) 

AC < MC


(4) MC cuts AC at AC’s minimum point i.e when AC is constant 

AC = MC


(5) MC CAN RISE WHEN AC IS FALLING  :: Since average cost is related to many or all  units of output so any increase or decrease in cost is distributed to all the units whereas in case of MC any change in cost is borne by additional unit only which makes MC change faster than AC. Hence MC  decreases faster than AC and reaches its minimum point  “A” earlier than minimum point of AC (point “B”). MC starts rising thereafter (from point A to B) whereas AC continues to decrease (from point C to B)

The relationship between marginal cost and average cost is an arithmetic relationship. To understand  this relationship let us take a numerical example.

Cost Of Production Class 12 Economics

Cost Of Production Class 12 Economics
Cost Of Production Class 12 Economics

CAN AC RISE WHEN MC IS FALLING ?  NO, because when MC falls , AC will also fall.

 

SPECIAL POINT :: The relationship between marginal cost (MC) and  average variable cost (AVC) is similar to the relationship between  marginal cost and average cost because marginal cost is not affected by fixed cost.
Thus, thi s relationship between marginal cost and average cost is a generalized relationship and holds valid in case of the marginal and average values of any variable, be it revenue or product etc.

 

SHOW AC (ATC), AVC, MC, AFC ON A SINGLE DIAGRAM

(1) AFC falls, approaches X - axis but never touches it and thus assumes the shape of RECTANGULAR HYPERBOLA
(2) AC, AVC, MC CURVES ARE U - SHAPED that is these cost curves initially decreases with increase in output but later on rises


Cost Of Production Class 12 Economics

AC AND AVC

(1) AC CURVE WILL ALWAYS LIE ABOVE THE AVC CURVE because AC includes both AVC and AFC at all levels of output and thus is greater than AVC by amount of AFC (AC - AVC = AFC)

(2) AVC REACHES ITS MINIMUM POINT (POINT “C”) AT A LEVEL OF OUTPUT LOWER THAT THAT OF AC ( POINT “B”) because when AVC is at its minimum point , AC is still falling because of falling AFC. Thus minimum of AC is to the right of minimum point of AVC

(3) With increase in output , the GAP/ VERTICAL DSITANCE  BETWEEN AC AND AVC DECREASE because the gap is AFC which coninues to decline with rise in output

(4) AC AND AVC NEVER INTERSECT each other because AFC can never be zero

MC WITH AC AND AVC

(1) WHEN MC IS LESS THAN AC & AVC , both of them FALL with increase in output that is

(AC or AVC) > MC


(2) W hen MC becomes equal to AC and AVC , they become constant. MC curve cuts AC curve at Point “B” and AVC at point “C” at their minimum points that is 

(AC or AVC) = MC

(3) When MC IS MORE THAN AC AND AVC , both of them RISES with increase in output that is

MC > (AC or AVC)

 

SPECIAL POINT
(a) MC = AVC = TVC at first level of output 
(b) Minimum point of MC comes before the minimum points of AC and AVC curves
(c) MC curve cuts both AC and AVC curves at their minimum points


WHAT IS U-SHAPED CURVE ? WHY AC, AVC AND MC ARE U-SHAPED ?

U- shaped cost curve means a curve that initially cost decreases with increase in output and after reaching a certain point (minimum point) it starts rising due to following reason

(1) APPLICATION OF LAW OF VARIABLE PROPORTION :: According to this law when in short run additional variable input (like raw material, labour) is employed on fixed factors, then
- initially increasing return sets in which causes proportional more increase in output than input and hence cost decreases,
- But after a certain output decreasing return prevails which means proportional less increases in output and hence cost increases.

(2) DUE TO UTILIZATION OF FIXED FACTORS :: Fixed cost on fixed factors is constant and hence when more output is produced by fully utilizing fixed factors, the same fixed cost gets distributed to large number of units produced which reduces per unit and marginal cost. However, later on frequent breakdown of fixed factors occurs due to over utilisation which causes repair and maintenance cost as well as overall cost to increase.

(3) AC IS VERTICAL SUMMATION OF AVC AND AFC :: In earlier stages both AVC and AFC decreases, these cause AC to decrease. After a certain output AVC increases and this increase is more powerful than decrease in AFC, thus AC starts rising

DIFFERENCE BETWEEN EXPLICIT (ACCOUNTING) COST AND IMPLICIT (NON ACCOUNTING) COST

B.O.DEXPLICIT COST  or ACCOUNTING COSTIMPLICIT COST  or NON ACCOUNTING COST
MEANINGIt refers to actual money expenditure of a firm in
(i) purchasing non- factor input and
(ii) hiring factor input (L,L,C,E)
Implicit cost are cost of self owned and self employed factors 
Entry in books of accountThese cost are recorded in books of account as it involves actual expenditure on buying and hiringThese cost are not recorded in books of account as no money cost is involved
Well defined or notThese cost are well definedThese cost are not well defined and hence are calculated (imputed cost)

contractual payment or not

Example

These cost are generally contractual payment and are made to outsiders

Wages paid to employer , Rent , Interest paid to bank

These cost are not made to outsiders

Interest  on own capital, rent on own land, Salaries for own labour


EXAMPLE :: Leaving a job of Rs. 40,000 per month and using his factory evicting where tenant was paying Rs. 50,000 per month, an entrepreneur undertakes production of garments. He pays Rs. 1,00,000 for the purchase of inputs. Find cost of production in terms of explicit cost and implicit cost.

Cost Of Production Class 12 Economics

Total Cost = Rs. 1,00,000 + Rs. 90,000  = Rs. 1,90,000

HOW TO MEASURE IMPLICIT COST :: Implicit cost is measured by determining the value of self occupied factors in terms of their market price.

Eg : if a doctor has opened a clinic at his home, then imputed value of salary for his service will be calculated on the basis of salary that he would receive if he is employed by someone else

FORMULA’S AT A GLANCE

TFC
(1)  Equal to TC at zero level
(2)  AFC X Output (3)  TC - TVC
TVC
(1)  equal to summation of MC i.e TVC = Σ MC
(2) AVC X Output
(3) TC - TFC
TC
(1) MC + TFC
(2)  ATC X Output
(3) TFC + TVC

 

AFC
(1) TFC  /  Output
(2) ATC - AVC
AVC
(1) TVC  /  Output
(2) ATC - AFC
AC
(1) TC  / Output
(2) AVC + AVC
MC
(1) TCn - TCn-1
(2) TVCn - TVCn-1
(3)  Cost Of Production Class 12 Economics
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FAQs on Cost Of Production Class 12 Economics

1. What is the cost of production?
Ans. The cost of production refers to the total expenses incurred by a company in manufacturing a product or providing a service. It includes the cost of raw materials, labor, overhead costs, and other expenses associated with the production process.
2. How is the cost of production calculated?
Ans. The cost of production is calculated by adding up all the expenses incurred during the production process. This includes the cost of raw materials, wages paid to labor, rent for the factory or production facility, utilities, machinery depreciation, and other overhead costs. By summing up these costs, the total cost of production can be determined.
3. What are fixed costs in the cost of production?
Ans. Fixed costs are expenses that do not change regardless of the level of production. They are incurred even when there is no production activity. Examples of fixed costs include rent, property taxes, insurance, and salaries of administrative staff. These costs remain constant within a certain production range and do not vary with the number of units produced.
4. What are variable costs in the cost of production?
Ans. Variable costs are expenses that change in direct proportion to the level of production. They vary as the number of units produced changes. Examples of variable costs include the cost of raw materials, direct labor wages, and electricity consumption. The higher the production volume, the higher the variable costs incurred.
5. How does the cost of production impact pricing decisions?
Ans. The cost of production plays a crucial role in determining the pricing strategies of a company. If the cost of production is high, the company may need to set higher prices for its products or services to cover the expenses and generate a profit. On the other hand, if the cost of production is low, the company may be able to offer competitive prices to attract customers. Pricing decisions need to consider the cost of production to ensure profitability and competitiveness in the market.
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