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© 2009 Prentice Hall Business Publishing Principles of Economics 9e by Case, Fair and Oster
PowerPoint Lectures for
Principles of Microeconomics, 9e
By
Karl E. Case, Ray C. Fair & Sharon M. Oster
; ;
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© 2009 Prentice Hall Business Publishing Principles of Economics 9e by Case, Fair and Oster
9PART II THE MARKET SYSTEM
Long-Run Costs and Output Decisions
Fernando & Yvonn Quijano
Prepared by:
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© 2009 Prentice Hall Business Publishing Principles of Economics 9e by Case, Fair and Oster
9PART II THE MARKET SYSTEM
CHAPTER OUTLINEShort-Run Conditions and Long-
Run Directions
Maximizing ProfitsMinimizing LossesThe Short-Run Industry Supply CurveLong-Run Directions: A Review
Long-Run Costs: Economies and Diseconomies of Scale
Increasing Returns to ScaleConstant Returns to ScaleDecreasing Returns to Scale
Long-Run Adjustmentsto Short-Run Conditions
Short-Run Profits: Expansion to EquilibriumShort-Run Losses: Contraction to EquilibriumThe Long-Run Adjustment Mechanism: Investment Flows toward Profit Opportunities
Output Markets: A Final Word
Appendix: External Economies and Diseconomies and the Long-Run Industry Supply Curve
Long-Run Costs and Output Decisions
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Long-Run Costs and Output Decisions
We begin our discussion of the long run by looking at firms in three short-run circumstances:
(1) firms earning economic profits,
(2) firms suffering economic losses but continuing to operate to reduce or minimize those losses, and
(3) firms that decide to shut down and bear losses just equal to fixed costs.
breaking even The situation in which a firm is earning exactly a normal rate of return.
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Short-Run Conditions and Long-Run Directions
Example: The Blue Velvet Car Wash
Maximizing Profits
TABLE 9.1 Blue Velvet Car Wash Weekly Costs
Total Fixed Costs (TFC)Total Variable Costs(TVC) (800 Washes)
Total Costs(TC = TFC + TVC) $ 3,600
1. Normal return to investors $ 1,000 1.2.
LaborMaterials
$ 1,000600
Total revenue (TR) at P = $5 (800 x $5) $ 4,000
2. Other fixed costs (maintenance contract, insurance, etc.) 1,000
$ 1,600 Profit (TR TC) $ 400
$ 2,000
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Refer to the figure. Given the market price and cost conditions described in the graphs, which of the four firms earns a normal rate of return?
a. A
b. B
c. C
d. D
e. All of the firms above earn a normal rate of return because they produce the level of output for which MR = MC.
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© 2009 Prentice Hall Business Publishing Principles of Economics 9e by Case, Fair and Oster
Refer to the figure. Given the market price and cost conditions described in the graphs, which of the four firms earns a normal rate of return?
a. A
b. B
c. C
d.d. DD
e. All of the firms above earn a normal rate of return because they produce the level of output for which MR = MC.
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Short-Run Conditions and Long-Run Directions
FIGURE 9.1 Firm Earning Positive Profits in the Short Run
A profit-maximizing perfectly competitive firm will produce up to the point where P* = MC. Profits are the difference between total revenue and total costs. At q* = 300, total revenue is $5 × 300 = $1,500, total cost is $4.20 × 300 = $1,260, and total profit = $1,500 $1,260 = $240.
Maximizing Profits
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Use the graph in the upper-left corner as a reference. When the firm produces 600 units of output, which area, A, B, or C, corresponds to the firm’s profit?
a. A
b. B
c. C
d. None of above. Profit is not anarea but a distance.
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© 2009 Prentice Hall Business Publishing Principles of Economics 9e by Case, Fair and Oster
Use the graph in the upper-left corner as a reference. When the firm produces 600 units of output, which area, A, B, or C, corresponds to the firm’s profit?
a. A
b. B
c.c. CC
d. None of above. Profit is not anarea but a distance.
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Short-Run Conditions and Long-Run Directions
operating profit (or loss) or net operating revenue Total revenue minus total variable cost (TR TVC).
■ If revenues exceed variable costs, operating profit is positive and can be used to offset fixed costs and reduce losses, and it will pay the firm to keep operating.
■ If revenues are smaller than variable costs, the firm suffers operating losses that push total losses above fixed costs. In this case, the firm can minimize its losses by shutting down.
Minimizing Losses
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Short-Run Conditions and Long-Run Directions
Producing at a Loss to Offset Fixed Costs: The Blue Velvet Revisited
TABLE 9.2 A Firm Will Operate If Total Revenue Covers Total Variable Cost
CASE 1: Shut Down CASE 2: Operate at Price = $3
Total Revenue (q = 0)
$ 0 Total Revenue ($3 x 800) $ 2,400
Fixed costsVariable costsTotal costs
+$
$
2,0000
2,000
Fixed costsVariable costsTotal costs
+$
$
2,0001,6003,600
Profit/loss (TR TC)
$ 2,000 Operating profit/loss (TR TVC) $ 800
Total profit/loss (TR TC) $ 1,200
Minimizing Losses
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Short-Run Conditions and Long-Run Directions
FIGURE 9.1 Firm Suffering Losses but Showing an Operating Profit in the Short Run
When price is sufficient to cover average variable costs, firms suffering short-run losses will continue operating instead of shutting down. Total revenues (P* × q*) cover variable costs, leaving an operating profit of $90 to cover part of fixed costs and reduce losses to $135.
Minimizing Losses
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Whether or not a firm decides to produce or shut down in the short run depends solely on whether revenues from operating are sufficient to cover:
a. Fixed costs.
b. Variable costs.
c. Total costs.
d. Normal profit.
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Whether or not a firm decides to produce or shut down in the short run depends solely on whether revenues from operating are sufficient to cover:
a. Fixed costs.
b.b. Variable costs.Variable costs.
c. Total costs.
d. Normal profit.
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Short-Run Conditions and Long-Run Directions
Shutting Down to Minimize Loss
TABLE 9.3 A Firm Will Shut Down If Total Revenue Is Less Than Total Variable Cost
Case 1: Shut Down CASE 2: Operate at Price = $1.50
Total Revenue (q = 0) $ 0 Total revenue ($1.50 x 800) $ 1,200
Fixed costsVariable costsTotal costs
+$
$
2,0000
2,000
Fixed costsVariable costsTotal costs
+$
$
2,0001,6003,600
Profit/loss (TR TC): $ 2,000 Operating profit/loss (TR TVC) $ 400
Total profit/loss (TR TC) $ 2,400
Minimizing Losses
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Short-Run Conditions and Long-Run Directions
FIGURE 9.1 Firm Suffering Losses but Showing an Operating Profit in the Short Run
At prices below average variable cost, it pays a firm to shut down rather than continue operating.Thus, the short-run supply curve of a competitive firm is the part of its marginal cost curve that lies above its average variable cost curve.
shut-down point The lowest point on the average variable cost curve. When price falls below the minimum point on AVC, total revenue is insufficient to cover variable costs and the firm will shut down and bear losses equal to fixed costs.
Minimizing Losses
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Refer to the figure below. Which of the firms below chooses to produce output at a loss?
a. A
b. C
c. Both A and C.
d. A, C, and D.
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Refer to the figure below. Which of the firms below chooses to produce output at a loss?
a.a. AA
b. C
c. Both A and C.
d. A, C, and D.
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Short-Run Conditions and Long-Run Directions
short-run industry supply curve The sum of the marginal cost curves (above AVC) of all the firms in an industry.
The Short-Run Industry Supply Curve
FIGURE 9.4 The Industry Supply Curve in the Short Run Is the Horizontal Sum of the Marginal Cost Curves (above AVC) of All the Firms in an Industry
A profit-maximizing perfectly competitive firm will produce up to the point where P* = If there are only three firms in the industry, the industry supply curve is simply the sum of all the products supplied by the three firms at each price. For example, at $6, firm 1 supplies 100 units, firm 2 supplies 200 units, and firm 3 supplies 150 units, for a total industry supply of 450.
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Short-Run Conditions and Long-Run Directions
Long-Run Directions: A Review
TABLE 9.4 Profits, Losses, and Perfectly Competitive Firm Decisions in the Long and Short Run
Short-Run Condition Short-Run Decision Long-Run Decision
Profits TR > TC P = MC: operate Expand: new firms enter
Losses 1. With operating profit P = MC: operate Contract: firms exit
(TR TVC) (losses < fixed costs)
2. With operating losses Shut down: Contract: firms exit
(TR < TVC) losses = fixed costs
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Long-Run Costs: Economies and Diseconomies of Scale
increasing returns to scale, or economies of scale An increase in a firm’s scale of production leads to lower costs per unit produced.
constant returns to scale An increase in a firm’s scale of production has no effect on costs per unit produced.
decreasing returns to scale, or diseconomies of scale An increase in a firm’s scale of production leads to higher costs per unit produced.
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Long-Run Costs: Economies and Diseconomies of Scale
Example: Economies of Scale in Egg Production
TABLE 9.5 Weekly Costs Showing Economies of Scale in Egg Production
Jones Farm Total Weekly Costs
15 hours of labor (implicit value $8 per hour) $120Feed, other variable costs 25Transport costs 15Land and capital costs attributable to egg production
17
$177Total output 2,400 eggsAverage cost $0.074 per egg
Chicken Little Egg Farms Inc. Total Weekly Costs
Labor $ 5,128Feed, other variable costs 4,115Transport costs 2,431Land and capital costs 19,230
$30,904Total output 1,600,000 eggsAverage cost $0.019 per egg
Increasing Returns to Scale
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Long-Run Costs: Economies and Diseconomies of Scale
long-run average cost curve (LRAC) A graph that shows the different scales on which a firm can choose to operate in the long run.
FIGURE 9.5 A Firm Exhibiting Economies of Scale
The long-run average cost curve of a firm shows the different scales on which the firm can choose to operate in the long run. Each scale of operation defines a different short run. Here we see a firm exhibiting economies of scale; moving from scale 1 to scale 3 reduces average cost.
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Long-Run Costs: Economies and Diseconomies of Scale
Constant Returns to Scale
Technically, the term constant returns means that the quantitative relationship between input and output stays constant, or the same, when output is increased.
Constant returns to scale mean that the firm’s long-run average cost curve remains flat.
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Refer to the figure below. The firm in question exhibits economies of scale:
a. Along the decreasing portion of the long-run average cost curve (LRAC), up until Q0.
b. Along the increasing portion of the long-run average cost curve (LRAC), after Q0.
c. At Q0, where LRAC is minimum.
d. Anywhere along the LRAC, as long as increasing the scale of operations does not affect cost per unit.
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Refer to the figure below. The firm in question exhibits economies of scale:
a.a. Along the decreasing portion of the long-run average cost curve Along the decreasing portion of the long-run average cost curve ((LRACLRAC), up until ), up until QQ00..
b. Along the increasing portion of the long-run average cost curve (LRAC), after Q0.
c. At Q0, where LRAC is minimum.
d. Anywhere along the LRAC, as long as increasing the scale of operations does not affect cost per unit.
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Long-Run Costs: Economies and Diseconomies of Scale
Decreasing Returns to Scale
FIGURE 9.6 A Firm Exhibiting Economies and Diseconomies of Scale
Economies of scale push this firm’s average costs down to q*. Beyond q*, the firm experiences diseconomies of scale; q* is the level of production at lowest average cost, using optimal scale.
optimal scale of plant The scale of plant that minimizes average cost.
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Long-Run Costs: Economies and Diseconomies of Scale
Blood bank merger ‘good’ for Manatee
Bradenton Herald.com
“Northwest needed to be aligned with a larger organization to achieve economy of scale,” said J.B. Gaskins, Florida Blood Services vice president. “That economy of scale is good for the whole network, including Manatee County.”
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Long-Run Adjustments to Short-Run Conditions
Short-Run Profits: Expansion to Equilibrium
FIGURE 9.7 Firms Expand in the Long Run When Increasing Returns to Scale Are Available
When economies of scale can be realized, firms have an incentive to expand. Thus, firms will be pushed by competition to produce at their optimal scales. Price will be driven to the minimum point on the LRAC curve.
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Long-Run Adjustments to Short-Run Conditions
In the long run, equilibrium price (P*) is equal to long-run average cost, short-run marginal cost, and short-run average cost. Profits are driven to zero:
P* = SRMC = SRAC = LRAC
Any price above P* means that there are profits to be made in the industry, and new firms will continue to enter. Any price below P* means that firms are suffering losses, and firms will exit the industry. Only at P* will profits be just equal to zero, and only at P* will the industry be in equilibrium.
Short-Run Profits: Expansion to Equilibrium
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Long-Run Adjustments to Short-Run Conditions
Short-Run Losses: Contraction to Equilibrium
FIGURE 9.8 Long-Run Contraction and Exit in an Industry Suffering Short-Run Losses
When firms in an industry suffer losses, there is an incentive for them to exit. As firms exit, the supply curve shifts from S0 to S1, driving price up to P*. As price rises,
losses are gradually eliminated and the industry returns to equilibrium.
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Long-Run Adjustments to Short-Run Conditions
Whether we begin with an industry in which firms are earning profits or suffering losses, the final long-run competitive equilibrium condition is the same:
P* = SRMC = SRAC = LRAC
and profits are zero. At this point, individual firms are operating at the most efficient scale of plant—that is, at the minimum point on their LRAC curve.
Short-Run Losses: Contraction to Equilibrium
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Refer to the figure below. Which level of output does the firm produce under long-run, perfectly competitive conditions?
a. q1.
b. Either q* or q1.
c. q*.
d. In the long run, the firm may produce any level of output, so both q* and q1 are possible.
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Refer to the figure below. Which level of output does the firm produce under long-run, perfectly competitive conditions?
a. q1.
b. Either q* or q1.
c.c. qq*.*.
d. In the long run, the firm may produce any level of output, so both q* and q1 are possible.
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Long-Run Adjustments to Short-Run Conditions
The Long-Run Average Cost Curve:Flat or U-Shaped?
The structure of the industry in the long run will depend on whether existing firms expand faster than new firms enter.
There is an element of randomness in the way industries expand. Most industries contain some large firms and some small firms,
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Long-Run Adjustments to Short-Run Conditions
Investment—in the form of new firms and expanding old firms—will over time tend to favor those industries in which profits are being made, and over time industries in which firms are suffering losses will gradually contract from disinvestment.
long-run competitive equilibrium When P = SRMC = SRAC = LRAC and profits are zero.
The Long-Run Adjustment Mechanism: Investment Flows Toward Profit Opportunities
The entry and exit of firms in response to profit opportunities usually involve the financial capital market. In capital markets, people are constantly looking for profits.When firms in an industry do well, capital is likely to flow into that industry in a variety of forms.
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Why Are Hot Dogs So Expensive in Central Park?In New York, you need alicense to operate a hot dogcart, and a license to operatein the park costs more. Sincehot dogs are $.50 more in thepark, the added cost of alicense each year must be roughly $.50 per hot dog sold. In fact, in New York City, licenses to sell hot dogs in the park are auctioned off for many thousands of dollars, while licenses to operate outside the park cost only about $1,000.
Long-Run Adjustments to Short-Run Conditions
The Long-Run Adjustment Mechanism: Investment Flows Toward Profit Opportunities
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Output Markets: A Final Word
In the last four chapters, we have been building a model of a simple market system under the assumption of perfect competition.
You have now seen what lies behind the demand curves and supply curves in competitive output markets. The next two chapters take up competitive input markets and complete the picture.
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REVIEW TERMS AND CONCEPTS
breaking evenconstant returns to scaledecreasing returns to scale,
or diseconomies of scaleincreasing returns to scale, or
economies of scalelong-run average cost curve
(LRAC)
long-run competitive equilibrium
operating profit (or loss) or net operating revenue
optimal scale of plant
short-run industry supply curve
shut-down point
long-run competitive equilibrium,
P = SRMC = SRAC = LRAC
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EXTERNAL ECONOMIES AND DISECONOMIES AND THE LONG-RUN INDUSTRY SUPPLY CURVE
When long-run average costs decrease as a result of industry growth, we say that there are external economies.
When average costs increase as a result of industry growth, we say that there are external diseconomies.
A P P E N D I X
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TABLE 9A.1 Construction of New Housing and Construction Materials Costs, 2000–2005
Year
House Prices % Change Over the
Previous YearHousing Starts(Thousands)
Housing Starts% Change Over
The Previous Year
Construction Materials Prices % Change Over The
Previous Year
Consumer Prices% Change Over
The Previous Year
2000 1,573
2001 7.5 1,661 5.6% 0% 2.8%
2002 7.5 1,710 2.9% 1.5% 1.5%
2003 7.9 1,853 8.4% 1.6% 2.3%
2004 12.0 1,949 5.2% 8.3% 2.7%
2005 13.0 2,053 5.3% 5.4% 2.5%
A P P E N D I X
Example of an expanding industry facing external diseconomies of scale
EXTERNAL ECONOMIES AND DISECONOMIES AND THE LONG-RUN INDUSTRY SUPPLY CURVE
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long-run industry supply curve (LRIS) A graph that traces out price and total output over time as an industry expands.
decreasing-cost industry An industry that realizes external economies—that is, average costs decrease as the industry grows. The long-run supply curve for such an industry has a negative slope.
A P P E N D I X
increasing-cost industry An industry that encounters external diseconomies—that is, average costs increase as the industry grows. The long-run supply curve for such an industry has a positive slope.
constant-cost industry An industry thatshows no economies or diseconomies ofscale as the industry grows. Such industries have flat, or horizontal, long-run supply curves.
THE LONG-RUN INDUSTRY SUPPLY CURVE
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AppendixTHE LONG-RUN INDUSTRY SUPPLY CURVE
A P P E N D I X
FIGURE 9A.1 A Decreasing-Cost Industry: External EconomiesIn a decreasing-cost industry, average cost declines as the industry expands. As demand expands from D0 to D1, price rises from P0 to P1.
As new firms enter and existing firms expand, supply shifts from S0 to S1, driving price
down. If costs decline as a result of the expansion to LRAC2, the final price will be below
P0 at P2.
The long-run industry supply curve (LRIS) slopes downward in a decreasing-cost industry.
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Appendix
A P P E N D I X
THE LONG-RUN INDUSTRY SUPPLY CURVE
FIGURE 9A.2 An Increasing-Cost Industry: External DiseconomiesIn an increasing-cost industry, average cost increases as the industry expands. As demand shifts from D0 to D1, price rises from P0 to P1.
As new firms enter and existing firms expand output, supply shifts from S0 to S1, driving
price down. If long-run average costs rise, as a result, to LRAC2, the final price will be P2.
The long-run industry supply curve (LRIS) slopes up in an increasing-cost industry.
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constant-cost industrydecreasing-cost industryexternal economies and diseconomiesincreasing-cost industrylong-run industry supply curve (LRIS)
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