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The Costs of Production （ see Textbook Chapter 13 ） 生产成本（见教材第 13 章） 9.1What are the Costs9.1

The Costs of Production （ see Textbook Chapter 13 ） 生产成本（见教材第 13 章） 9.1What are the Costs9.1 9.1 什么是成本 9.2Production and Costs 9.2 生产与成本 9.3The Yarrious Measures of Cost 9.3 成本的各种衡量 9.4Costs in The Short Run and in the Long Run 9.4 短期与长期成本. 9.

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The Costs of Production （ see Textbook Chapter 13 ） 生产成本（见教材第 13 章） 9.1What are the Costs9.1

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  1. The Costs of Production（ see Textbook Chapter 13 ） 生产成本（见教材第13章） 9.1What are the Costs9.1 9.1什么是成本 9.2Production and Costs 9.2生产与成本 9.3The Yarrious Measures of Cost 9.3成本的各种衡量 9.4Costs in The Short Run and in the Long Run 9.4短期与长期成本 9

  2. ACTIVE LEARNING 1: Brainstorming You run General Motors. • List 3 different costs you have. • List 3 different business decisions that are affected by your costs. 1

  3. In this chapter, look for the answers to these questions: • What is a production function? What is marginal product? How are they related? • What are the various costs, and how are they related to each other and to output? • How are costs different in the short run vs. the long run? • What are “economies of scale”?

  4. the amount a firm receives from the sale of its output the market value of the inputs a firm uses in production Total Revenue, Total Cost, Profit总收益、总成本和利润 0 • We assume that the firm’s goal is to maximize profit. Profit = Total revenue – Total cost

  5. Costs: Explicit vs. Implicit成本：显性与隐性 0 • Explicit costs – require an outlay of money,e.g. paying wages to workers • Implicit costs – do not require a cash outlay,e.g. the opportunity cost of the owner’s time • Remember one of the Ten Principles:The cost of something is what you give up to get it. • This is true whether the costs are implicit or explicit. Both matter for firms’ decisions.

  6. Explicit vs. Implicit Costs: An Example显性与隐性成本：示例 0 You need $100,000 to start your business. The interest rate is 5%. • Case 1: borrow $100,000 • explicit cost = $5000 interest on loan • Case 2: use $40,000 of your savings, borrow the other $60,000 • explicit cost = $3000 (5%) interest on the loan • implicit cost = $2000 (5%) foregone interest you could have earned on your $40,000. In both cases, total (exp+ imp) costs are $5000.

  7. Economic Profit vs. Accounting Profit经济成本&会计成本 0 • Accounting profit = total revenue minus total explicit costs • Economic profit = total revenue minus total costs (including explicit and implicit costs) • Accounting profit ignores implicit costs, so it’s higher than economic profit.

  8. ACTIVE LEARNING 2: Economic profit vs. accounting profit The equilibrium rent on office space has just increased by $500/month. Compare the effects on accounting profit and economic profit if a. you rent your office space b. you own your office space 7

  9. ACTIVE LEARNING 2: Answers The rent on office space increases $500/month. a. You rent your office space. Explicit costs increase $500/month. Accounting profit & economic profit each fall $500/month. b. You own your office space. Explicit costs do not change, so accounting profit does not change. Implicit costs increase $500/month (opp. cost of using your space instead of renting it), so economic profit falls by $500/month. 8

  10. The Production Function生产函数 0 • A production function shows the relationship between the quantity of inputs used to produce a good, and the quantity of output of that good. • It can be represented by a table, equation, or graph. • Example 1: • Farmer Jack grows wheat. • He has 5 acres of land. • He can hire as many workers as he wants.

  11. L(no. of workers) Q(bushels of wheat) 3,000 2,500 0 0 2,000 1 1000 1,500 Quantity of output 2 1800 1,000 3 2400 500 4 2800 0 0 1 2 3 4 5 5 3000 No. of workers Example 1: Farmer Jack’s Production Function农民杰克的生产函数 0

  12. ∆Q ∆L Marginal Product边际产品 0 • If Jack hires one more worker, his output rises by the marginal product of labor. • The marginal productof any input is the increase in output arising from an additional unit of that input, holding all other inputs constant. • Notation: ∆ (delta) = “change in…” Examples: ∆Q = change in output, ∆L = change in labor • Marginal product of labor (MPL) =

  13. L(no. of workers) Q(bushels of wheat) 0 0 ∆Q = 1000 ∆L = 1 1 1000 ∆Q = 800 ∆L = 1 2 1800 ∆L = 1 ∆Q = 600 3 2400 ∆Q = 400 ∆L = 1 4 2800 ∆L = 1 ∆Q = 200 5 3000 EXAMPLE 1: Total & Marginal Product例1：总共产品与边际产品 0 MPL 1000 800 600 400 200

  14. 3,000 2,500 2,000 Quantity of output 1,500 1,000 500 0 0 1 2 3 4 5 No. of workers EXAMPLE 1: MPL = Slope of Prod Function例1： MPL =生产函数斜线 0 L(no. of workers) Q(bushels of wheat) MPL MPL equals the slope of the production function. Notice that MPL diminishes as L increases. This explains why the production function gets flatter as L increases. 0 0 1000 1 1000 800 2 1800 600 3 2400 400 4 2800 200 5 3000

  15. Why MPL Is Important为什么MPL重要 • Recall one of the Ten Principles:Rational people think at the margin. • When Farmer Jack hires an extra worker, • his costs rise by the wage he pays the worker • his output rises by MPL • Comparing them helps Jack decide whether he would benefit from hiring the worker.

  16. Why MPL Diminishes为什么MPL减弱 • Farmer Jack’s output rises by a smaller and smaller amount for each additional worker. Why? • As Jack adds workers, the average worker has less land to work with and will be less productive. • In general, MPL diminishes as L rises whether the fixed input is land or capital (equipment, machines, etc.). • Diminishing marginal product: the marginal product of an input declines as the quantity of the input increases (other things equal)

  17. EXAMPLE 1: Farmer Jack’s Costs例1：农民杰克的成本 • Farmer Jack must pay $1000 per month for the land, regardless of how much wheat he grows. • The market wage for a farm worker is $2000 per month. • So Farmer Jack’s costs are related to how much wheat he produces….

  18. $1,000 $0 $1,000 $1,000 $2,000 $3,000 $1,000 $4,000 $5,000 $1,000 $6,000 $7,000 $1,000 $8,000 $9,000 $1,000 $10,000 $11,000 EXAMPLE 1: Farmer Jack’s Costs例1：农民杰克的成本 0 L(no. of workers) Q(bushels of wheat) cost of land cost of labor Total Cost 0 0 1 1000 2 1800 3 2400 4 2800 5 3000

  19. EXAMPLE 1: Farmer Jack’s Total Cost Curve例1：农民杰克的总成本曲线

  20. MC = ∆TC ∆Q Marginal Cost边际成本 • Marginal Cost (MC) is the increase in Total Cost from producing one more unit:

  21. Q(bushels of wheat) Total Cost 0 $1,000 ∆TC = $2000 ∆Q = 1000 1000 $3,000 ∆TC = $2000 ∆Q = 800 1800 $5,000 ∆TC = $2000 ∆Q = 600 2400 $7,000 ∆TC = $2000 ∆Q = 400 2800 $9,000 ∆TC = $2000 ∆Q = 200 3000 $11,000 EXAMPLE 1: Total and Marginal Cost例1：总成本和边际成本 Marginal Cost (MC) $2.00 $2.50 $3.33 $5.00 $10.00

  22. $2.00 $2.50 $3.33 $5.00 $10.00 EXAMPLE 1: The Marginal Cost Curve例1：边际成本曲线 Q(bushels of wheat) TC MC MC usually rises as Q rises, as in this example. 0 $1,000 1000 $3,000 1800 $5,000 2400 $7,000 2800 $9,000 3000 $11,000

  23. Why MC Is Important为什么边际成本重要 • Farmer Jack is rational and wants to maximize his profit. To increase profit, should he produce more wheat, or less? • To find the answer, Farmer Jack needs to “think at the margin.” • If the cost of additional wheat (MC) is less than the revenue he would get from selling it, then Jack’s profits rise if he produces more.

  24. Fixed and Variable Costs不变成本和可变成本 0 • Fixed costs(FC) – do not vary with the quantity of output produced. • For Farmer Jack, FC = $1000 for his land • Other examples: cost of equipment, loan payments, rent • Variable costs (VC) – vary with the quantity produced. • For Farmer Jack, VC = wages he pays workers • Other example: cost of materials • Total cost (TC) = FC + VC

  25. EXAMPLE 2例2 • Our second example is more general, applies to any type of firm, producing any good with any types of inputs.

  26. $100 $0 $100 100 70 170 100 120 220 100 160 260 100 210 310 100 280 380 100 380 480 100 520 620 EXAMPLE 2: Costs 0 $800 FC Q FC VC TC VC $700 TC 0 $600 1 $500 2 Costs $400 3 $300 4 $200 5 $100 6 $0 7 0 1 2 3 4 5 6 7 Q

  27. MC = ∆TC ∆Q EXAMPLE 2: Marginal Cost（边际成本） Recall, Marginal Cost (MC)is the change in total cost from producing one more unit: Q TC MC 0 $100 $70 1 170 50 2 220 40 3 260 Usually, MC rises as Q rises, due to diminishing marginal product. Sometimes (as here), MC falls before rising. (In other examples, MC may be constant.) 50 4 310 70 5 380 100 6 480 140 7 620 CHAPTER 13 THE COSTS OF PRODUCTION

  28. n.a. $100 50 33.33 25 20 16.67 14.29 EXAMPLE 2: Average Fixed Cost（平均固定成本） 0 Average fixed cost (AFC)is fixed cost divided by the quantity of output: AFC = FC/Q Q FC AFC 0 $100 1 100 2 100 3 100 Notice that AFC falls as Q rises: The firm is spreading its fixed costs over a larger and larger number of units. 4 100 5 100 6 100 7 100

  29. n.a. $70 60 53.33 52.50 56.00 63.33 74.29 EXAMPLE 2: Average Variable Cost（平均可变成本） 0 Average variable cost (AVC)is variable cost divided by the quantity of output: AVC = VC/Q Q VC AVC 0 $0 1 70 2 120 3 160 As Q rises, AVC may fall initially. In most cases, AVC will eventually rise as output rises. 4 210 5 280 6 380 7 520

  30. AFC AVC n.a. n.a. n.a. $170 $100 $70 110 50 60 86.67 33.33 53.33 77.50 25 52.50 76 20 56.00 80 16.67 63.33 88.57 14.29 74.29 EXAMPLE 2: Average Total Cost（平均总成本） 0 Average total cost (ATC) equals total cost divided by the quantity of output: ATC = TC/Q Q TC ATC 0 $100 1 170 2 220 3 260 Also, ATC = AFC + AVC 4 310 5 380 6 480 7 620

  31. $200 $175 $150 $125 Costs $100 $75 $50 $25 $0 0 1 2 3 4 5 6 7 Q EXAMPLE 2: Average Total Cost（平均总成本） 0 Q TC ATC Usually, as in this example, the ATC curve is U-shaped. 0 $100 n.a. 1 170 $170 2 220 110 3 260 86.67 4 310 77.50 5 380 76 6 480 80 7 620 88.57

  32. $200 $175 $150 AFC $125 AVC Costs $100 ATC $75 MC $50 $25 $0 0 1 2 3 4 5 6 7 Q EXAMPLE 2:The Various Cost Curves Together不同成本曲线结合 0

  33. ACTIVE LEARNING 3: Costs Fill in the blank spaces of this table. Q VC TC AFC AVC ATC MC 0 $50 n.a. n.a. n.a. $10 1 10 $10 $60.00 2 30 80 30 3 16.67 20 36.67 4 100 150 12.50 37.50 5 150 30 60 6 210 260 8.33 35 43.33 32

  34. ACTIVE LEARNING 3: Answers First, deduce FC = $50 and use FC + VC = TC. Use AFC = FC/Q Use ATC = TC/Q Use relationship between MC and TC Use AVC = VC/Q Q VC TC AFC AVC ATC MC 0 $0 $50 n.a. n.a. n.a. $10 1 10 60 $50.00 $10 $60.00 20 2 30 80 25.00 15 40.00 30 3 60 110 16.67 20 36.67 40 4 100 150 12.50 25 37.50 50 5 150 200 10.00 30 40.00 60 6 210 260 8.33 35 43.33 33

  35. $200 $175 $150 $125 Costs $100 $75 $50 $25 $0 0 1 2 3 4 5 6 7 Q EXAMPLE 2: Why ATC Is Usually U-Shaped例2：为什么平均总成本曲线总是U形 0 As Q rises: Initially, falling AFCpulls ATC down. Eventually, rising AVCpulls ATC up.

  36. $200 $175 $150 $125 Costs $100 ATC $75 MC $50 $25 $0 0 1 2 3 4 5 6 7 Q EXAMPLE 2:ATC and MC（平均总成本 与边际成本） 0 When MC < ATC, ATC is falling. When MC > ATC, ATC is rising. The MC curve crosses the ATC curve at the ATC curve’s minimum.

  37. Costs in the Short Run & Long Run短期与长期平均总成本 • Short run: Some inputs are fixed (e.g., factories, land). The costs of these inputs are FC. • Long run: All inputs are variable (e.g., firms can build more factories, or sell existing ones) • In the long run, ATC at any Q is cost per unit using the most efficient mix of inputs for that Q (e.g., the factory size with the lowest ATC).

  38. AvgTotalCost ATCM ATCS ATCL Q EXAMPLE 3: LRATC with 3 factory Sizes Firm can choose from 3 factory sizes: S, M, L. Each size has its own SRATC curve. The firm can change to a different factory size in the long run, but not in the short run.

  39. AvgTotalCost ATCM ATCS ATCL Q QA QB EXAMPLE 3: LRATC with 3 factory Sizes To produce less than QA, firm will choose size Sin the long run. To produce between QAand QB, firm will choose size Min the long run. To produce more than QB, firm will choose size Lin the long run. LRATC

  40. ATC LRATC Q A Typical LRATC Curve In the real world, factories come in many sizes, each with its own SRATC curve. So a typical LRATC curve looks like this:

  41. ATC LRATC Q How ATC Changes As the Scale of Production Changes产量规模变化时平均总成本怎样变化的 Economies of scale: ATC falls as Q increases. Constant returns to scale: ATC stays the same as Q increases. Diseconomies of scale: ATC rises as Q increases.

  42. How ATC Changes As the Scale of Production Changes产量规模变化时平均总成本怎样变化的 • Economies of scale occur when increasing production allows greater specialization: workers more efficient when focusing on a narrow task. • More common when Q is low. • Diseconomies of scale are due to coordination problems in large organizations. E.g., management becomes stretched, can’t control costs. • More common when Q is high.

  43. CONCLUSION总结 • Costs are critically important to many business decisions, including production, pricing, and hiring. • This chapter has introduced the various cost concepts. • The following chapters will show how firms use these concepts to maximize profits in various market structures.

  44. CHAPTER SUMMARY • Implicit costs do not involve a cash outlay, yet are just as important as explicit costs to firms’ decisions. • Accounting profit is revenue minus explicit costs. Economic profit is revenue minus total (explicit + implicit) costs. • The production function shows the relationship between output and inputs.

  45. CHAPTER SUMMARY • The marginal product of labor is the increase in output from a one-unit increase in labor, holding other inputs constant. The marginal products of other inputs are defined similarly. • Marginal product usually diminishes as the input increases. Thus, as output rises, the production function becomes flatter, and the total cost curve becomes steeper. • Variable costs vary with output; fixed costs do not. CHAPTER 13 THE COSTS OF PRODUCTION

  46. CHAPTER SUMMARY • Marginal cost is the increase in total cost from an extra unit of production. The MC curve is usually upward-sloping. • Average variable cost is variable cost divided by output. • Average fixed cost is fixed cost divided by output. AFC always falls as output increases. • Average total cost (sometimes called “cost per unit”) is total cost divided by the quantity of output. The ATC curve is usually U-shaped.

  47. CHAPTER SUMMARY • The MC curve intersects the ATC curve at minimum average total cost. When MC < ATC, ATC falls as Q rises. When MC > ATC, ATC rises as Q rises. • In the long run, all costs are variable. • Economies of scale: ATC falls as Q rises. Diseconomies of scale: ATC rises as Q rises. Constant returns to scale: ATC remains constant as Q rises. CHAPTER 13 THE COSTS OF PRODUCTION

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