1. Chapter 5 Production

2. Chapter 6Slide 2 Introduction Focus is the supply side. The theory of the firm will address: How a firm makes cost-minimizing production decisions How cost varies with output Characteristics of market supply

3. Chapter 6Slide 3 The Technology of Production The Production Process Combining inputs or factors of production to achieve an output Categories of Inputs (factors of production) Labor Materials Capital

4. Chapter 6Slide 4 The Technology of Production Production Function: Indicates the highest output that a firm can produce for every specified combination of inputs given the state of technology. Shows what is technically feasible when the firm operates efficiently.

5. Chapter 6Slide 5 The Technology of Production The production function for two inputs: Q = F(K,L) Q = Output, K = Capital, L = Labor For a given technology

6. Chapter 6Slide 6 Isoquants Assumptions Curves showing all possible combinations of inputs that yield the same output Food producer has two inputs  Labor (L) & Capital (K)

7. Chapter 6Slide 7 Isoquants Observations: 1) For any level of K, output increases with more L. 2)For any level of L, output increases with more K. 3)Various combinations of inputs produce the same output.

8. Chapter 6Slide 8 Production Function for Food 12040556575 24060758590 3557590100105 46585100110115 57590105115120 Capital Input12345 Labor Input

9. Chapter 6Slide 9 Production with Two Variable Inputs (L,K) Labor per year 1 2 3 4 12345 5 Q 1 = 55 The isoquants are derived from the production function for output of of 55, 75, and 90. A D B Q 2 = 75 Q 3 = 90 C E Capital per year The Isoquant Map

10. Chapter 6Slide 10 Isoquants The isoquants emphasize how different input combinations can be used to produce the same output. This information allows the producer to respond efficiently to changes in the markets for inputs. Input Flexibility

11. Chapter 6Slide 11 Isoquants Short-run: Period of time in which quantities of one or more production factors cannot be changed. These inputs are called fixed inputs. Long-run Amount of time needed to make all production inputs variable. The Short Run versus the Long Run

12. Chapter 6Slide 12 AmountAmountTotalAverage Marginal of Labor (L)of Capital (K)Output (Q)ProductProduct Production with One Variable Input (Labor) 0100------ 110101010 210301520 310602030 410802020 510951915 6101081813 710112164 810112140 91010812-4 101010010-8

13. Chapter 6Slide 13 Observations: 1) With additional workers, output (Q) increases, reaches a maximum, and then decreases. Production with One Variable Input (Labor)

14. Chapter 6Slide 14 Observations: 2) The average product of labor (AP), or output per worker, increases and thendecreases. Production with One Variable Input (Labor)

15. Chapter 6Slide 15 Observations: 3) The marginal product of labor (MP), or output of the additional worker, increases rapidly initially and then decreases and becomes negative.. Production with One Variable Input (Labor)

16. Chapter 6Slide 16 Total Product A: slope of tangent = MP (20) B: slope of OB = AP (20) C: slope of OC= MP & AP Labor per Month Output per Month 60 112 023456789101 A B C D Production with One Variable Input (Labor)

17. Chapter 6Slide 17 Average Product Production with One Variable Input (Labor) 8 10 20 Outpu t per Month 02345679101 Labor per Month 30 E Marginal Product Observations: Left of E: MP > AP & AP is increasing Right of E: MP < AP & AP is decreasing E: MP = AP & AP is at its maximum

18. Chapter 6Slide 18 Observations: When MP = 0, TP is at its maximum When MP > AP, AP is increasing When MP < AP, AP is decreasing When MP = AP, AP is at its maximum Production with One Variable Input (Labor)

19. Chapter 6Slide 19 As the use of an input increases in equal increments, a point will be reached at which the resulting additions to output decreases (i.e. MP declines). Production with One Variable Input (Labor) The Law of Diminishing Marginal Returns

20. Chapter 6Slide 20 When the labor input is small, MP increases due to specialization. When the labor input is large, MP decreases due to inefficiencies. Can be used for long-run decisions to evaluate the trade-offs of different plant patterns The Law of Diminishing Marginal Returns Production with One Variable Input (Labor)

21. Chapter 6Slide 21 The Effect of Technological Improvement Labor per time period Output per time period 50 100 023456789101 A O1O1 C O3O3 O2O2 B Labor productivity can increase if there are improvements in technology, even though any given production process display diminishing returns to labor.

22. Chapter 6Slide 22 Production with Two Variable Inputs Long-run production K& L are variable. Isoquants analyze and compare the different combinations of K & L and output

23. Chapter 6Slide 23 The Shape of Isoquants Labor per year 1 2 3 4 12345 5 Q 1 = 55 Q 2 = 75 Q 3 = 90 Capital per year A D B C E

24. Chapter 6Slide 24 Reading the Isoquant Model 1)Assume capital is 3 and labor increases from 1 to 2 to 3.  Notice output increases at a decreasing rate illustrating diminishing returns from labor in the short-run and long-run. Production with Two Variable Inputs Diminishing Marginal Rate of Substitution

25. Chapter 6Slide 25 Reading the Isoquant Model 2)Assume labor is 3 and capital increases from 1 to 2 to 3.  Output also increases at a decreasing rate due to diminishing returns from capital. Diminishing Marginal Rate of Substitution Production with Two Variable Inputs

26. Chapter 6Slide 26 Substituting Among Inputs Managers want to determine what combination if inputs to use. They must deal with the trade-off between inputs. The slope of each isoquant gives the trade- off between two inputs while keeping output constant. Production with Two Variable Inputs

27. Chapter 6Slide 27 Substituting Among Inputs The marginal rate of technical substitution equals: Production with Two Variable Inputs

28. Chapter 6Slide 28 Marginal Rate of Technical Substitution Labor per month 1 2 3 4 12345 5 Capital per year Isoquants are downward sloping and convex like indifference curves. 1 1 1 1 2 1 Q 1 =55 Q 2 =75 Q 3 =90

29. Chapter 6Slide 29 Observations: 1)Increasing labor in one unit increments from 1 to 5 results in a decreasing MRTS 2) Diminishing MRTS occurs because of diminishing returns and implies isoquants are convex. Production with Two Variable Inputs

30. Chapter 6Slide 30 Observations: 3)The change in output from a change in labor equals: Production with Two Variable Inputs

31. Chapter 6Slide 31 Observations: 3)The change in output from a change in capital equals: Production with Two Variable Inputs

32. Chapter 6Slide 32 Observations: 3)MRTS and Marginal Productivity  If output is constant and labor is increased, then: Production with Two Variable Inputs

33. Chapter 6Slide 33 Isoquants When Inputs are Perfectly Substitutable Labor per month Capital per month Q1Q1 Q2Q2 Q3Q3 A B C

34. Chapter 6Slide 34 Observations when inputs are perfectly substitutable: 1)The MRTS is constant at all points on the isoquant. Production with Two Variable Inputs Perfect Substitutes

35. Chapter 6Slide 35 Observations when inputs are perfectly substitutable: 2) For a given output, any combination of inputs can be chosen (A, B, or C) to generate the same level of output Production with Two Variable Inputs Perfect Substitutes

36. Chapter 6Slide 36 Fixed-Proportions Production Function Labor per month Capital per month L1L1 K1K1 Q1Q1 Q2Q2 Q3Q3 A B C

37. Chapter 6Slide 37 Observations when inputs must be in a fixed-proportion: 1)No substitution is possible. Each output requires a specific amount of each input. Fixed-Proportions Production Function Production with Two Variable Inputs

38. Chapter 6Slide 38 Observations when inputs must be in a fixed-proportion: 2) To increase output requires more labor and capital (i.e. moving from A to B to C which is technically efficient). Fixed-Proportions Production Function Production with Two Variable Inputs

39. Chapter 6Slide 39 Returns to Scale Measuring the relationship between the scale (size) of a firm and output 1)Increasing returns to scale: output more than doubles when all inputs are doubled  Larger output associated with lower cost  The isoquants get closer together

40. Chapter 6Slide 40 Returns to Scale Labor (hours) Capital (machine hours) 10 20 30 Increasing Returns: The isoquants move closer together 510 2 4 0 A

41. Chapter 6Slide 41 Returns to Scale Measuring the relationship between the scale (size) of a firm and output 2)Constant returns to scale: output doubles when all inputs are doubled  Size does not affect productivity  May have a large number of producers  Isoquants are equidistant apart

42. Chapter 6Slide 42 Returns to Scale Labor (hours) Capital (machine hours) Constant Returns: Isoquants are equally spaced 10 20 30 15510 2 4 0 A 6

43. Chapter 6Slide 43 Returns to Scale Measuring the relationship between the scale (size) of a firm and output 3)Decreasing returns to scale: output less than doubles when all inputs are doubled  Decreasing efficiency with large size  Reduction of entrepreneurial abilities

44. Chapter 6Slide 44 Returns to Scale Labor (hours) Capital (machine hours) Decreasing Returns: Isoquants get further apart 10 20 30 510 2 4 0 A

45. Chapter 6Slide 45 Summary A production function describes the maximum output a firm can produce for each specified combination of inputs. An isoquant is a curve that shows all combinations of inputs that yield a given level of output.

46. Chapter 6Slide 46 Summary Average product of labor measures the productivity of the average worker, whereas marginal product of labor measures the productivity of the last worker added.

47. Chapter 6Slide 47 Summary The law of diminishing returns explains that the marginal product of an input eventually diminishes as its quantity is increased.

48. Chapter 6Slide 48 Summary In long-run analysis, we tend to focus on the firm’s choice of its scale or size of operation.