Chapter 5 (cont’d) Costs (Long-Run). Sony Morita: Came to U.S. in 1955 hoping to sell his new radio. His story is illustrated in this diagram. 51050100.

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Presentation transcript:

Chapter 5 (cont’d) Costs (Long-Run)

Sony Morita: Came to U.S. in 1955 hoping to sell his new radio. His story is illustrated in this diagram Cost per unit

Copyright © Houghton Mifflin Company.All rights reserved. 5b–3 Sony Notice that Morita’s curve is U-shaped Why?

Copyright © Houghton Mifflin Company.All rights reserved. 5b–4 Production An entrepreneur must put together resources -- land, labor, capital -- and produce a product people will be willing and able to purchase. In the planning period -- long run -- the entrepreneur has the option of choosing any combination of inputs.

Copyright © Houghton Mifflin Company.All rights reserved. 5b–5 Combining Resources There are many combinations of resources that could be used. Consider the following table showing different quantities of mechanics and different quantities of airplanes that the hypothetical airlines PWA might use:

Copyright © Houghton Mifflin Company.All rights reserved. 5b–6 Alternative Quantities of Output that Can Be Produced by Different Combinations of Resources

Copyright © Houghton Mifflin Company.All rights reserved. 5b–7 Long Run What is the difference between the short run and the long run? The long run is a period of time just long enough that all resources (inputs) are variable. So, in terms of the manufacturing table, we have...

Copyright © Houghton Mifflin Company.All rights reserved. 5b–8 Alternative Quantities of Output that Can Be Produced by Different Combinations of ALL Resources

Copyright © Houghton Mifflin Company.All rights reserved. 5b–9 Long Run All resources are variable. This means that the firm can choose any combination on the manufacturing table, not just those along column labeled “10.”

Copyright © Houghton Mifflin Company.All rights reserved. 5b–10 Production to Costs If either of the resources is fixed, then we get diminishing marginal returns as we increase the other resource. For instance, we could fix the number of airplanes at any level, say 10, 20, or 40. And vary the number of mechanics.

Copyright © Houghton Mifflin Company.All rights reserved. 5b–11 Notice what occurs as the number of mechanics is increased at any of the levels of airplanes:

Copyright © Houghton Mifflin Company.All rights reserved. 5b–12 Production to Costs Or we could fix the number of mechanics and vary the number of airplanes.

Copyright © Houghton Mifflin Company.All rights reserved. 5b–13 Notice what occurs to output as the number of airplanes is increased at any of the levels of mechanics:

Copyright © Houghton Mifflin Company.All rights reserved. 5b–14 Production to Costs If we fix either of the resources, then we get diminishing marginal returns as we increase the other resource. However, in the long run, both resources are variable. So what happens to output as we vary both resources?

Copyright © Houghton Mifflin Company.All rights reserved. 5b–15 The Long Run or Planning Period: As we double both resources, what happens to output?

Copyright © Houghton Mifflin Company.All rights reserved. 5b–16 Scale : Size of Firm As the scale or size of the firm is increased, that is, as all resources are increased, what happens to output --- to per-unit costs? Since at each fixed level of resources, there are diminishing marginal returns as we vary one of the resources, then there are U-shaped cost curves for each scale.

Copyright © Houghton Mifflin Company.All rights reserved. 5b–17 Notice what happens to output as resources are doubled -- it initially more than doubles and then increases less quickly. What does this mean for costs?

Costs

Copyright © Houghton Mifflin Company.All rights reserved. 5b–19 Economies of Scale As output rises and the scale of the firm increases, costs per unit of output: Decrease---called economies of scale. Increase---called diseconomies of scale. Remain constant---called constant returns to scale.

This is referred to as economies of scale or size. Costs

This is referred to as diseconomies of scale or size. Costs

Copyright © Houghton Mifflin Company.All rights reserved. 5b–22 Economies of Scale Not all firms or industries have a U- shaped long run cost curve. Economies or diseconomies do not come about because of a law like the law of diminishing marginal returns. Thus, some industries may have only economies, others only diseconomies, and others constant returns to scale.

Costs Output LRATC What if ATC in the long run looks like this?

Costs Output LRATC What if long run ATC and demand look like this? Demand

Costs Output LRATC What if long run ATC looks like this?

Costs Output LRATC What if long run ATC looks like this Demand and demand like this?

Costs Output LRATC What if long run ATC looks like this?

Costs Output LRATC What if long run ATC and demand look like this? Demand

Costs Output LRATC What if long run ATC looks like this? Demand and demand looks like this?

Copyright © Houghton Mifflin Company.All rights reserved. 5b–30 Economies of Scope Are there per-unit changes in cost resulting from diversifying or expanding the scope of business? If cost increases, then there are diseconomies of scope. If cost decreases: then there are economies of scope. Cases: Bayer, BASF, Hoechst Cases: Advertising agencies

The Experience Curve Aircraft Chickens Cumulative Output Cost per Unit

Aircraft Chickens Cumulative Output Cost per Unit The Experience Curve NOTICE THIS!!!

Copyright © Houghton Mifflin Company.All rights reserved. 5b–33 The Experience Curve Monsanto vs. Holland Sweetener NutraSweet brand -- Monsanto spent 7 years “marching down the learning curve.”

Copyright © Houghton Mifflin Company.All rights reserved. 5b–34 Measuring Costs Historic Cost measuring costs on the basis of what the asset originally cost the firm. Current Cost measuring costs on the basis of what a current replacement of the asset would cost. The historic costs look back; the current costs look at the present; and the stock market value looks forward.

Copyright © Houghton Mifflin Company.All rights reserved. 5b–35 Measuring Costs None of these measures tells us much of use. What we really want to know is what the return would be to funds used to purchase assets for this firm if those funds were used in another investment. The firm’s performance must be compared to what else the investor’s money could be used for -- the alternatives. This is called opportunity cost.

Copyright © Houghton Mifflin Company.All rights reserved. 5b–36 Measuring Costs Accountants do not provide information about opportunity costs because it is too subjective and hard to measure. There is a move to try to capture opportunity costs: Measuring economic profit has been proposed and adopted by some firms. Economic profit = operating profit - (cost of capital)(amount of capital)

Copyright © Houghton Mifflin Company.All rights reserved. 5b–37 Measuring Costs Coca-Cola has adopted economic profit for planning and a basis for managerial compensation. In economics, all costs are opportunity costs.

Copyright © Houghton Mifflin Company.All rights reserved. 5b–38 Measuring Costs In economics, all costs are opportunity costs. The cost curves measure opportunity costs -- account for what else the funds could be used for. It is reasonably straightforward to move from accounting costs for labor, land, and materials to opportunity costs (in fact, their accounting costs are probably good measures of opportunity costs).

Copyright © Houghton Mifflin Company.All rights reserved. 5b–39 Measuring Costs Capital (and non compensated time of the owner) is more difficult. If an asset were purchased 5 years ago, historic costs would measure only the original cost and current costs would only measure replacement costs. What about the lost returns from not investing in other alternatives? This is not closely approximated by either original cost or current cost.

Copyright © Houghton Mifflin Company.All rights reserved. 5b–40 Measuring Costs Thus, you might compare the returns to what a marginal firm would have to pay to acquire the asset. A marginal firm is a firm that is neither adding value nor subtracting it. It is typically the firm in the industry that is at the bottom of the rung---without going out of business, Consider the following situations:

$ output AVC ATC Demand 1 What is the situation depicted here? What is the green line?

$ output AVC ATC Demand 2 And here, with demand 2, what is the situation?

$ output AVC ATC Demand 3 Now, at demand 3, what is the situation? What is the green line?

Copyright © Houghton Mifflin Company.All rights reserved. 5b–44 Summary Review of Costs Scale -- Long Run Economies of Scale Diseconomies of Scale Returns to Scale Constant Returns to Scale Minimum Efficient Scale Returns or Product -- Short Term Diminishing Marginal Returns Diminishing Marginal Product

$ output ATC 2 ATC 1 Demand 1 Application: Downsizing could result in a shift of cost curves. Or a move along one cost curve.

Copyright © Houghton Mifflin Company.All rights reserved. 5b–46 Outsourcing and Joint Ventures Outsourcing would be illustrated not much differently than the previous case of downsizing. The size of the firm would decrease in the case of outsourcing – efficiency should increase. In the case of a joint venture, many alternative things might happen: reduced costs, decreased size, increased demand, or increased size and increased efficiency.