1. Production and Cost Analysis II 13 Production and Cost Analysis II Economic efficiency consists of making things that are worth more than they cost. — J. M. Clark CHAPTER 13 Copyright © 2010 by the McGraw-Hill Companies, Inc. All rights reserved. McGraw-Hill/Irwin

2. Production and Cost Analysis II 13 Making Long-Run Production Decisions Neither plant size or technology available is given Firms look at costs of various inputs and the technologies available for combining these inputs Firms have more options in the long run and they can change any input they want They choose the combination that offers the lowest cost 13-2

3. Production and Cost Analysis II 13 Technical Efficiency and Economic Efficiency Technical efficiency in production means that as few inputs as possible are used to produce a given output When choosing among existing technologies in the long run, firms are interested in the lowest cost (economically efficient) methods of production The economically efficient method of production is the method that produces a given level of output at the lowest possible cost. It is the least-cost technically efficient process 13-3

4. Production and Cost Analysis II 13 Determinants of the Shape of the Long-Run Cost Curve All inputs are variable in the long run The law of diminishing marginal productivity does not apply in the long run The shape of the long-run cost curve is due to the existence of economies and diseconomies of scale 13-4

5. Production and Cost Analysis II 13 Economies of Scale An indivisible setup cost is the cost of an indivisible input for which a certain minimum amount of production must be undertaken before the input becomes economically feasible to use The cost of a blast furnace or an oil refinery is an example of an indivisible setup cost Production exhibits economies of scale when long-run average total costs decrease as output increases Indivisible setup costs create many real-world economies of scale These are shown by the downward sloping portion of the long-run average total cost curve 13-5

6. Production and Cost Analysis II 13 Economies of Scale The minimum efficient level of production or optimal-sized firm is the amount of production that spreads setup costs out sufficiently for firms to undertake production profitably The minimum efficient level of production is reached once the size of the market expands to a size large enough for firms to take advantage of all economies of scale Because of the importance of economies of scale, business people often talk about the minimum efficient level of production 13-6

7. Production and Cost Analysis II 13 Diseconomies of Scale Diseconomies of scale usually, but not always, start occurring as firms get large Production exhibits diseconomies of scale when long- run average total costs increase as output increases These are shown by the upward sloping portion of the long-run average total cost curve 13-7

8. Production and Cost Analysis II 13 Diseconomies of Scale Two reasons for diseconomies of scale are: 1.Increased monitoring costs (the costs incurred by the organizer of production in seeing to it that the employees do what they’re supposed to do) 2.Loss of team spirit (the feelings of friendship and being part of a team that bring out people’s best efforts) 13-8

9. Production and Cost Analysis II 13 Constant Returns to Scale Constant returns to scale are shown by the flat portion of the long-run average total cost curve Constant returns to scale occur when production techniques can be replicated again and again to increase output Production exhibits constant economies of scale when average total costs do not change as output increases This occurs before monitoring costs rise and team spirit is lost 13-9

10. Production and Cost Analysis II 13 The Importance of Economies and Diseconomies of Scale Economies and diseconomies of scale account for the shape of the long-run average cost curve Economies and diseconomies of scale play important roles in real-world production decisions The long-run and short-run average cost curves have the same U-shape, but the underlying causes of this shape differ Initially increasing and eventually diminishing marginal productivity accounts for the shape of the short-run average cost curves 13-10

11. Production and Cost Analysis II 13 A Typical Long-Run Average Total Cost Table Q TC of Labor ($) TC of Machines ($) TC ($)ATC ($) 1138125463558 1239026065054 1340226867052 1442028070050 1545030075050 1648032080050 1751034085050 1854936691551 19600400100053 20666444111056 ATC falls because of economies of scale ATC is constant because of constant returns to scale ATC rises because of diseconomies of scale 13-11

12. Production and Cost Analysis II 13 A Typical Long-Run Average Total Cost Curve Q Costs per unit 11 $50 $55 17 $60 1420 Long-run average total cost (LRATC) ATC falls because of economies of scale ATC is constant because of constant returns to scale ATC rises because of diseconomies of scale Minimum efficient level of production 13-12

13. Production and Cost Analysis II 13 The Envelope Relationship In the short run all expansion must proceed by increasing only the variable input This constraint increases cost There is an envelope relationship between long-run and short-run average total costs. Each short-run cost curve touches the long-run cost curve at only one point. Long-run costs are always less than or equal to short-run costs because: In the long run, all inputs are flexible In the short run, some inputs are fixed 13-13

14. Production and Cost Analysis II 13 The Envelope of Short-Run Average Total Cost Curves SRMC 3 SRATC 3 SRMC 4 SRATC 4 SRMC 1 SRATC 1 SRMC 2 SRATC 2 LRATC Q Costs per unit The long-run average total cost curve (LRATC) is an envelope of the short-run average total cost curves (SRATC 1-4 ) 13-14

15. Production and Cost Analysis II 13 Using Cost Analysis in the Real World Economies of scope Learning by doing and technological change Many dimensions Unmeasured costs Joint costs Indivisible costs Some of the problems of using cost analysis in the real- world include the following: Uncertainty Asymmetries Multiple planning and adjustment periods with many different short runs And many more 13-15

16. Production and Cost Analysis II 13 Using Cost Analysis in the Real World There are economies of scope when the costs of producing goods are interdependent so that it is less costly for a firm to produce one good when it is already producing another The cost of production of one product often depends on what other products a firm is producing Economies of Scope 13-16

17. Production and Cost Analysis II 13 Learning by doing means that as we do something, we learn what works and what doesn’t, and over time we become more proficient at it Technological change is an increase in the range of production techniques that leads to more efficient ways of producing goods and the production of new and better goods Production techniques available to real-world firms are constantly changing These changes occur over time and cannot be predicted accurately Using Cost Analysis in the Real World Learning by Doing and Technological Change 13-17

18. Production and Cost Analysis II 13 Using Cost Analysis in the Real World Many Dimensions The level of output is the only dimension in the standard model Good economic decisions take all relevant margins into account Most decisions that firms make involve more than one dimension, including: Quality Packaging Shipping 13-18

19. Production and Cost Analysis II 13 Chapter Summary An economically efficient production process must be technically efficient, but a technically efficient process may not be economically efficient The long-run average total cost curve is U-shaped because economies of scale cause average total cost to decrease; diseconomies of scale eventually cause average total cost to increase Marginal cost and short-run average cost curves slope upward because of diminishing marginal productivity 13-19

20. Production and Cost Analysis II 13 Chapter Summary The long-run average cost curve slopes upward because of diseconomies of scale The envelope relationship between short-run and long- run average cost curves reflects that the short-run average cost curves are always above the long-run average cost curve, except at just one point An entrepreneur is an individual who sees an opportunity to sell an item at a price higher than the average cost of producing it 13-20

21. Production and Cost Analysis II 13 Chapter Summary Once we start applying cost analysis to the real world, we must include a variety of other dimensions of costs that the standard model does not cover Costs in the real world are affected by: Economies of scope Learning by doing and technological change Many dimensions to output Unmeasured costs, such as opportunity costs 13-21