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UNIT - 3
ECONOMICS COSTS
ECONOMIES AND DISECONOMIES OF SCALE
 The economist’s idea of cost is based on the fact
that resources are scares and have alternative
uses.
 Thus if resources are used for the production of
some commodities, then it means that the
production of some alternative commodities are
forgone.
OPPORTUNITY COST
 The cost of this choice is the benefit of the next best
alternative foregone. This is called opportunity cost.
 This choice implies sacrifice of other alternatives. hence
cost of this choice will be evaluated in terms of the
sacrificed alternatives.
 Therefore, opportunity cost is the highest valued benefit
that must be sacrificed as a result of choosing
alternative.
EXPLICIT COST- OUT OF POCKET COSTS
 The money payment, which a firm makes to those
‘outsiders’ who supply labour services, raw
materials, transport services, electricity etc. are
called explicit costs
IMPLICIT COST
 The cost of “self owned” resources
 Salary of proprietor
 Interest on entrepreneurs own investment
 Rent on own land
FIXED COST & VARIABLE COST
 SHORT RUN & LONG RUN
SHORT RUN
AVOIDABLE AND UNAVOIDABLE COST
 At times a firm faces a problem of retrenchment or
contraction , costs which can be avoided are called
as avoidable costs and costs which cannot be
avoided are called as unavoidable costs.
INCREMENTAL AND SUNK COSTS
 Costs which increases because of expansion of a
firm are called incremental costs.
 Cost which have to be born whether there is
expansion or not are called sunk costs
IF COMPANY WANTS TO PURCHASE A
MACHINE
 Cost of purchase
 Installation charges
 Maintenance charges
 Operational charges
COMMON AND TRACEABLE COSTS
HISTORICAL AND REPLACEMENT COSTS
 Total fixed costs
 Total variable costs
 Total costs = Total fixed costs + Total variable costs
AVERAGE FIXED COSTS

 AFC= TFC/Units of output
AVERAGE VARIABLE COSTS
 TVC/Units of output
TOTAL AVERAGE COSTS
 TOTAL AVERAGE COSTS= AFC+AVC
MARGINAL COST
 MC= Change in total costs/ change in output
DISECONOMIES OF SMALL SCALE PRODUCTION
 Expenses
 Labour costs
 Wastage
 No real feel of market
ECONOMIES OF SCALE
 Internal economies are those advantages of large
production which accrue to a firm on account of its
superior technique and management
TECHNICAL ECONOMIES
COMMERCIAL ECONOMIES
MANAGERIAL ECONOMIES
FINANCIAL ECONOMIES
RISK AND UNCERTAINTY
EXTERNAL ECONOMIES
DISECONOMIES OF LARGE SCALE
PRODUCTION
 As a firm expands beyond a certain limit,it becomes
unmanageable and unwieldy.
 Management and supervision becomes difficult
 Labour unions
 Loss of coordination ( No direct contact with
customers)
 Overproduction
 Cut throat competition
 Adaptation
 International relations
1
 TC=100+50Q-11Q2+Q3
 FIND:
MC,AC & AVC
 PROVE THAT MC PASSESS THROUGH MINIMUM POINT OF AVC
2
 TVC=50Q-10Q2+Q3
 FIND THE LEVEL OF OUTPUT WHERE MC IS A
MINIMUM
 FIND THE LEVEL OF OUTPUT WHERE AVC IS A
MINIMUM
Q TC FC VC ATC AFC AVC MC
0 125 125 0
10 175 125 50 17.5 12.5 5
20 125 10.50 6.25
30 125 110 4.16
40 255 125 3.125
50 125 2.5
60 125 2.08 3
70 125 5 1.78
80 125 295 1.56
Q TC TFC TVC AFC AVC ATC MC
0
1 200 100 100
2 290 95
3 123
4 110 71
5 420 20 84 80
6 103.8
7 751 107.28 128
8 801
9 1098 998 197
10 10 123.2
Q TC TFC TVC AFC AVC ATC MC
0 100 100
1 200 100 100 100 100 200 100
2 290 100 190 50 95 145 90
3 369 100 269 33.33 89.66 123 109
4 440 100 340 25 85 110 71
5 520 100 420 20 84 104 80
6 622.8 100 522.8 16.66 87.13 103.8 102.8
7 751 100 651 14.28 93 107.28 128
8 901 100 801 12.5 100.12 112.62 150
9 1098 100 998 11.11 110.88 122 197
10 1332 100 1232 10 123.2 133.2 234
4.
 For a firm, the average cost function is estimated as
AC = 100/Q + 20 + 4Q
 What is total variable cost for the firm at an output
of 15 units?
5.
 If the production function is Q = 20K 0.3 L 0.3, what is
the marginal rate of technical substitution of labor
for capital?
6.
 Which of the following cost functions signifies a
long-run cost function?
 a. TC = 250 + 3Q b. TC = 300
 c. TC = 50 + 100Q + 2Q2 d. Both (b) and (c)
 e. None of the above.
7.
 Mr. Subba Rao, owner of Billow Garments &
Brothers, employs labor and knitting machines as
inputs to produce woolen garments. The following
are the marginal productivity functions of labor and
capital for the firm:
 MPK = 0.75L0.75/K0.25 , MPL = 0.75 K0.75/L0.25
 If the wage paid to the laborers is Rs.8 and the cost
of capital is Rs.5 each, what is the cost minimizing
proportion of L to K?
8.
 The production function of a firm is Q = 250L0.5.
What should be the quantity of labor that the firm
should hire to maximize total profits, when price of
the good is Rs.2 and wage rate is Rs.25.
9
 If the total cost function is TC = 200 – 4Q + 6Q2 and
the output is 4 units, what is the marginal cost ?

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cost & economies (1).pptx

  • 1. UNIT - 3 ECONOMICS COSTS ECONOMIES AND DISECONOMIES OF SCALE
  • 2.  The economist’s idea of cost is based on the fact that resources are scares and have alternative uses.  Thus if resources are used for the production of some commodities, then it means that the production of some alternative commodities are forgone.
  • 3. OPPORTUNITY COST  The cost of this choice is the benefit of the next best alternative foregone. This is called opportunity cost.  This choice implies sacrifice of other alternatives. hence cost of this choice will be evaluated in terms of the sacrificed alternatives.  Therefore, opportunity cost is the highest valued benefit that must be sacrificed as a result of choosing alternative.
  • 4.
  • 5. EXPLICIT COST- OUT OF POCKET COSTS  The money payment, which a firm makes to those ‘outsiders’ who supply labour services, raw materials, transport services, electricity etc. are called explicit costs
  • 6. IMPLICIT COST  The cost of “self owned” resources  Salary of proprietor  Interest on entrepreneurs own investment  Rent on own land
  • 7. FIXED COST & VARIABLE COST  SHORT RUN & LONG RUN
  • 9. AVOIDABLE AND UNAVOIDABLE COST  At times a firm faces a problem of retrenchment or contraction , costs which can be avoided are called as avoidable costs and costs which cannot be avoided are called as unavoidable costs.
  • 10. INCREMENTAL AND SUNK COSTS  Costs which increases because of expansion of a firm are called incremental costs.  Cost which have to be born whether there is expansion or not are called sunk costs
  • 11. IF COMPANY WANTS TO PURCHASE A MACHINE  Cost of purchase  Installation charges  Maintenance charges  Operational charges
  • 14.  Total fixed costs  Total variable costs  Total costs = Total fixed costs + Total variable costs
  • 15. AVERAGE FIXED COSTS   AFC= TFC/Units of output
  • 16. AVERAGE VARIABLE COSTS  TVC/Units of output
  • 17. TOTAL AVERAGE COSTS  TOTAL AVERAGE COSTS= AFC+AVC
  • 18. MARGINAL COST  MC= Change in total costs/ change in output
  • 19. DISECONOMIES OF SMALL SCALE PRODUCTION  Expenses  Labour costs  Wastage  No real feel of market
  • 20. ECONOMIES OF SCALE  Internal economies are those advantages of large production which accrue to a firm on account of its superior technique and management
  • 27. DISECONOMIES OF LARGE SCALE PRODUCTION  As a firm expands beyond a certain limit,it becomes unmanageable and unwieldy.  Management and supervision becomes difficult  Labour unions  Loss of coordination ( No direct contact with customers)
  • 28.  Overproduction  Cut throat competition
  • 30. 1  TC=100+50Q-11Q2+Q3  FIND: MC,AC & AVC  PROVE THAT MC PASSESS THROUGH MINIMUM POINT OF AVC
  • 31. 2  TVC=50Q-10Q2+Q3  FIND THE LEVEL OF OUTPUT WHERE MC IS A MINIMUM  FIND THE LEVEL OF OUTPUT WHERE AVC IS A MINIMUM
  • 32. Q TC FC VC ATC AFC AVC MC 0 125 125 0 10 175 125 50 17.5 12.5 5 20 125 10.50 6.25 30 125 110 4.16 40 255 125 3.125 50 125 2.5 60 125 2.08 3 70 125 5 1.78 80 125 295 1.56
  • 33. Q TC TFC TVC AFC AVC ATC MC 0 1 200 100 100 2 290 95 3 123 4 110 71 5 420 20 84 80 6 103.8 7 751 107.28 128 8 801 9 1098 998 197 10 10 123.2
  • 34. Q TC TFC TVC AFC AVC ATC MC 0 100 100 1 200 100 100 100 100 200 100 2 290 100 190 50 95 145 90 3 369 100 269 33.33 89.66 123 109 4 440 100 340 25 85 110 71 5 520 100 420 20 84 104 80 6 622.8 100 522.8 16.66 87.13 103.8 102.8 7 751 100 651 14.28 93 107.28 128 8 901 100 801 12.5 100.12 112.62 150 9 1098 100 998 11.11 110.88 122 197 10 1332 100 1232 10 123.2 133.2 234
  • 35. 4.  For a firm, the average cost function is estimated as AC = 100/Q + 20 + 4Q  What is total variable cost for the firm at an output of 15 units?
  • 36. 5.  If the production function is Q = 20K 0.3 L 0.3, what is the marginal rate of technical substitution of labor for capital?
  • 37. 6.  Which of the following cost functions signifies a long-run cost function?  a. TC = 250 + 3Q b. TC = 300  c. TC = 50 + 100Q + 2Q2 d. Both (b) and (c)  e. None of the above.
  • 38. 7.  Mr. Subba Rao, owner of Billow Garments & Brothers, employs labor and knitting machines as inputs to produce woolen garments. The following are the marginal productivity functions of labor and capital for the firm:  MPK = 0.75L0.75/K0.25 , MPL = 0.75 K0.75/L0.25  If the wage paid to the laborers is Rs.8 and the cost of capital is Rs.5 each, what is the cost minimizing proportion of L to K?
  • 39. 8.  The production function of a firm is Q = 250L0.5. What should be the quantity of labor that the firm should hire to maximize total profits, when price of the good is Rs.2 and wage rate is Rs.25.
  • 40. 9  If the total cost function is TC = 200 – 4Q + 6Q2 and the output is 4 units, what is the marginal cost ?