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© 2009 Pearson Education, Inc. Publishing as Prentice Hall Principles of Economics 9e by Case, Fair and Oster 1 of 32
PowerPoint Lectures for
Principles of Economics, 9e
By
Karl E. Case, Ray C. Fair & Sharon M. Oster
; ;
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© 2009 Pearson Education, Inc. Publishing as Prentice Hall Principles of Economics 9e by Case, Fair and Oster
8PART II THE MARKET SYSTEM
Choices Made by Households and Firms
Short-Run Costs and
Output Decisions
Fernando & Yvonn Quijano
Prepared by:
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© 2009 Pearson Education, Inc. Publishing as Prentice Hall Principles of Economics 9e by Case, Fair and Oster 4 of 32
8Short-Run Costs
andOutput Decisions
Costs in the Short RunFixed CostsVariable CostsTotal CostsShort-Run Costs: A Review
Output Decisions: Revenues, Costs, and Profit Maximization Total Revenue (TR) and Marginal
Revenue (MR)Comparing Costs and Revenues to Maximize ProfitThe Short-Run Supply Curve
Looking Ahead
CHAPTER OUTLINE
PART II THE MARKET SYSTEM Choices Made by Households and
Firms
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© 2009 Pearson Education, Inc. Publishing as Prentice Hall Principles of Economics 9e by Case, Fair and Oster 5 of 32
Short-Run Costs and Output Decisions
You have seen that firms in perfectly competitive industries make three specific decisions.
FIGURE 8.1 Decisions Facing Firms
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© 2009 Pearson Education, Inc. Publishing as Prentice Hall Principles of Economics 9e by Case, Fair and Oster 6 of 32
Costs in the Short Run
fixed cost Any cost that does not depend on the firms level of output. These costs are incurred even if the firm is producing nothing. There are no fixed costs in the long run.
variable cost A cost that depends on the level of production chosen.
total cost (TC) Fixed costs plus variable costs.
TC = TFC + TVC
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© 2009 Pearson Education, Inc. Publishing as Prentice Hall Principles of Economics 9e by Case, Fair and Oster 7 of 32
Costs in the Short Run
total fixed costs (TFC) or overhead The total of all costs that do not change with output even if output is zero.
Total Fixed Cost (TFC)
Fixed Costs
TABLE 8.1 Short-Run Fixed Cost (Total and Average) of a Hypothetical Firm
(1) Q (2) TFC (3) AFC (TFC/Q)
012345
$1,0001,0001,0001,0001,0001,000
$ 1,000
500333250200
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© 2009 Pearson Education, Inc. Publishing as Prentice Hall Principles of Economics 9e by Case, Fair and Oster 8 of 32
Costs in the Short Run
Total Fixed Cost (TFC)
Fixed Costs
FIGURE 8.2 Short-Run Fixed Cost (Total and Average) of a Hypothetical Firm
Average fixed cost is simply total fixed cost divided by the quantity of output. As output increases, average fixed cost declines because we are dividing a fixed number ($1,000) by a larger and larger quantity.
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© 2009 Pearson Education, Inc. Publishing as Prentice Hall Principles of Economics 9e by Case, Fair and Oster 9 of 32
Costs in the Short Run
Average Fixed Cost (AFC)
Fixed Costs
average fixed cost (AFC) Total fixed cost divided by the number of units of output; a per-unit measure of fixed costs.
TFCAFC
q
spreading overhead The process of dividing total fixed costs by more units of output. Average fixed cost declines as quantity rises.
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© 2009 Pearson Education, Inc. Publishing as Prentice Hall Principles of Economics 9e by Case, Fair and Oster 10 of 32
Costs in the Short Run
Total Variable Cost (TVC)
Variable Costs
total variable cost (TVC) The total of all costs that vary with output in the short run.
total variable cost curve A graph that shows the relationship between total variable cost and the level of a firm’s output.
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© 2009 Pearson Education, Inc. Publishing as Prentice Hall Principles of Economics 9e by Case, Fair and Oster 11 of 32
(9 x $2) + (6 x $1) = $24
(6 x $2) + (14 x $1) = $26
6
14
9
6
A
B
3 units ofoutput
(7 x $2) + (6 x $1) = $20
(4 x $2) + (10 x $1) = $18
6
10
7
4
A
B
2 units ofoutput
4
6
(4 x $2) + (4 x $1) = $12
(2 x $2) + (6 x $1) = $10
4
2
A
B
1 unit of output
Total Variable Cost Assuming PK = $2, PL = $1
TVC = (K x PK) + (L x PL) Using
Technique
Units of Input Required(Production Function)
K L Produce
TABLE 8.2 Derivation of Total Variable Cost Schedule from Technology and Factor Prices
Costs in the Short Run
Total Variable Cost (TVC)
Variable Costs
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© 2009 Pearson Education, Inc. Publishing as Prentice Hall Principles of Economics 9e by Case, Fair and Oster 12 of 32
Costs in the Short Run
Total Variable Cost (TVC)
Variable Costs
FIGURE 8.3 Total Variable Cost Curve
In Table 8.2, total variable cost is derived from production requirements and input prices. A total variable cost curve expresses the relationship between TVC and total output.
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© 2009 Pearson Education, Inc. Publishing as Prentice Hall Principles of Economics 9e by Case, Fair and Oster 13 of 32
Costs in the Short Run
Marginal Cost (MC)
Variable Costs
marginal cost (MC) The increase in total cost that results from producing 1+ more unit of output. Marginal costs reflect changes in variable costs.
TABLE 8.3 Derivation of Marginal Cost from Total Variable Cost
Units of Output Total Variable Costs ($) Marginal Costs ($)
0
1
2
3
0
10
18
24
10
8
6
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© 2009 Pearson Education, Inc. Publishing as Prentice Hall Principles of Economics 9e by Case, Fair and Oster 14 of 32
Costs in the Short Run
The Shape of the Marginal Cost Curve in the Short Run
Variable Costs
FIGURE 8.4 Declining Marginal Product Implies That Marginal Cost Will Eventually Rise with Output
In the short run, every firm is constrained by some fixed factor of production. A fixed factor implies diminishing returns (declining marginal product) and a limited capacity to produce.As that limit is approached, marginal costs rise.
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© 2009 Pearson Education, Inc. Publishing as Prentice Hall Principles of Economics 9e by Case, Fair and Oster 15 of 32
Costs in the Short Run
The Shape of the Marginal Cost Curve in the Short Run
Variable Costs
In the short run, every firm is constrained by some fixed input that (1) leads to diminishing returns to variable inputs and (2) limits its capacity to produce. As a firm approaches that capacity, it becomes increasingly costly to produce successively higher levels of output. Marginal costs ultimately increase with output in the short run.
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© 2009 Pearson Education, Inc. Publishing as Prentice Hall Principles of Economics 9e by Case, Fair and Oster 16 of 32
Costs in the Short Run
Graphing Total Variable Costs and Marginal Costs
Variable Costs
FIGURE 8.5 Total Variable Cost and Marginal Cost for a Typical Firm
Total variable costs always increase with output. Marginal cost is the cost of producing each additional unit. Thus, the marginal cost curve shows how total variable cost changes with single- unit increases in total output.
MCTVCTVC
q
TVCTVC
1Δ of slope
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© 2009 Pearson Education, Inc. Publishing as Prentice Hall Principles of Economics 9e by Case, Fair and Oster 17 of 32
Costs in the Short Run
Average Variable Cost (AVC)
Variable Costs
TVC
AVCq
average variable cost (AVC) Total variable cost divided by the number of units of output.
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© 2009 Pearson Education, Inc. Publishing as Prentice Hall Principles of Economics 9e by Case, Fair and Oster 18 of 32
Costs in the Short Run
Average Variable Cost (AVC)
Variable Costs
TABLE 8.4 Short-Run Costs of a Hypothetical Firm
(1)q
(2)TVC
(3)MC
( TVC)
(4)AVC
(TVC/q)(5)
TFC
(6)TC
(TVC + TFC)
(7)AFC
(TFC/q)
(8)ATC (TC/q orAFC + AVC)
0 $ 0 $ $ $ 1,000
$ 1,000 $ $
1 10 10 10 1,000
1,010 1,000 1,010
2 18 8 9 1,000
1,018 500 509
3 24 6 8 1,000
1,024 333 341
4 32 8 8 1,000
1,032 250 258
5 42 10 8.4 1,000
1,042 200 208.4
500 8,000 20 16 1,000
9,000 2 18
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© 2009 Pearson Education, Inc. Publishing as Prentice Hall Principles of Economics 9e by Case, Fair and Oster 19 of 32
Costs in the Short Run
Graphing Average Variable Costs and Marginal Costs
Variable Costs
FIGURE 8.6 More Short-Run Costs
When marginal cost is below average cost, average cost is declining. When marginal cost is above average cost, average cost is increasing.Rising marginal cost intersects average variable cost at the minimum point of AVC.
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© 2009 Pearson Education, Inc. Publishing as Prentice Hall Principles of Economics 9e by Case, Fair and Oster 20 of 32
Costs in the Short Run
Total Costs
FIGURE 8.7 Total Cost = Total Fixed Cost + Total Variable Cost
Adding TFC to TVC means adding the same amount of total fixed cost to every level of total variable cost. Thus, the total cost curve has the same shape as the total variable cost curve; it is simply higher by an amount equal to TFC.
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© 2009 Pearson Education, Inc. Publishing as Prentice Hall Principles of Economics 9e by Case, Fair and Oster 21 of 32
Costs in the Short Run
Total Costs
Average Total Cost (ATC)
average total cost (ATC) Total cost divided by the number of units of output.
q
TCATC
AVCAFC ATC
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Costs in the Short Run
Total Costs
Average Total Cost (ATC)
FIGURE 8.8 Average Total Cost = Average Variable Cost + Average Fixed Cost
To get average total cost, we add average fixed and average variable costs at all levels of output.Because average fixed cost falls with output, an ever-declining amount is added to AVC. Thus, AVC and ATC get closer together as output increases, but the two lines never meet.
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© 2009 Pearson Education, Inc. Publishing as Prentice Hall Principles of Economics 9e by Case, Fair and Oster 23 of 32
Costs in the Short Run
Total Costs
The Relationship Between Average Total Cost and Marginal Cost
If marginal cost is below average total cost, average total cost will decline toward marginal cost. If marginal cost is above average total cost, average total cost will increase. As a result, marginal cost intersects average total cost at ATC’s minimum point, for the same reason that it intersects the average variable cost curve at its minimum point.
The relationship between average total cost and marginal cost is exactly the same as the relationship between average variable cost and marginal cost.
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© 2009 Pearson Education, Inc. Publishing as Prentice Hall Principles of Economics 9e by Case, Fair and Oster 24 of 32
Costs in the Short Run
Short-Run Costs: A Review
TABLE 8.5 A Summary of Cost Concepts
Term Definition Equation
Accounting costs Out-of-pocket costs or costs as an accountant would define them. Sometimes referred to as explicit costs.
Economic costs Costs that include the full opportunity costs of all inputs. These include what are often called implicit costs.
Total fixed costs Costs that do not depend on the quantity of output produced. These must be paid even if output is zero.
TFC
Total variable costs Costs that vary with the level of output. TVC
Total cost The total economic cost of all the inputs used by a firm in production.
TC = TFC + TVC
Average fixed costs Fixed costs per unit of output. AFC = TFC/q
Average variable costs Variable costs per unit of output. AVC = TVC/q
Average total costs Total costs per unit of output. ATC = TC/q ATC = AFC + AVC
Marginal costs The increase in total cost that results from producing 1 additional unit of output.
MC = TC/q
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Costs in the Short Run
Short-Run Costs: A Review
Average and Marginal Costs at a College
Costs in Dollars
Students Total Fixed Cost Total Variable Cost
Total Cost Average Total Cost
500 $60 million $ 20 million $ 80 million
$160,000
1,000 60 million 40 million 100 million 100,000
1,500 60 million 60 million 120 million 80.000
2,000 60 million 80 million 140 million 70,000
2,500 60 million 100 million 60 million 60,000
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© 2009 Pearson Education, Inc. Publishing as Prentice Hall Principles of Economics 9e by Case, Fair and Oster 26 of 32
Output Decisions: Revenues, Costs, and Profit Maximization
perfect competition An industry structure in which there are many firms, each small relative to the industry, producing virtually identical products and in which no firm is large enough to have any control over prices. In perfectly competitive industries, new competitors can freely enter and exit the market.
homogeneous products Undifferentiated products; products that are identical to, or indistinguishable from, one another.
Perfect Competition
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Output Decisions: Revenues, Costs, and Profit Maximization
Perfect Competition
FIGURE 8.9 Demand Facing a Single Firm In a Perfectly Competitive Market
If a representative firm in a perfectly competitive market raises the price of its output above $2.45, the quantity demanded of that firm’s output will drop to zero. Each firm faces a perfectly elastic demand curve, d.
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© 2009 Pearson Education, Inc. Publishing as Prentice Hall Principles of Economics 9e by Case, Fair and Oster 28 of 32
Output Decisions: Revenues, Costs, and Profit Maximization
Total Revenue (TR) and Marginal Revenue (MR)
P x qTR quantity x pricerevenue total
total revenue (TR) The total amount that a firm takes in from the sale of its product: the price per unit times the quantity of output the firm decides to produce (P x q).
marginal revenue (MR) The additional revenue that a firm takes in when it increases output by one additional unit. In perfect competition, P = MR.
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© 2009 Pearson Education, Inc. Publishing as Prentice Hall Principles of Economics 9e by Case, Fair and Oster 29 of 32
Output Decisions: Revenues, Costs, and Profit MaximizationComparing Costs and Revenues to Maximize Profit
FIGURE 8.10 The Profit-Maximizing Level of Output for a Perfectly Competitive Firm
If price is above marginal cost, as it is at 100 and 250 units of output, profits can be increased by raising output; each additional unit increases revenues by more than it costs to produce the additional output. Beyond q* = 300, however, added output will reduce profits. At 340 units of output, an additional unit of output costs more to produce than it will bring in revenue when sold on the market. Profit-maximizing output is thus q*, the point at which P* = MC.
The Profit-Maximizing Level of Output
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Output Decisions: Revenues, Costs, and Profit Maximization
Comparing Costs and Revenues to Maximize Profit
The Profit-Maximizing Level of Output
As long as marginal revenue is greater than marginal cost, even though the difference between the two is getting smaller, added output means added profit. Whenever marginal revenue exceeds marginal cost, the revenue gained by increasing output by 1 unit per period exceeds the cost incurred by doing so.
The profit-maximizing perfectly competitive firm will produce up to the point where the price of its output is just equal to short-run marginal cost—the level of output at which P* = MC.
The profit-maximizing output level for all firms is the output level where MR = MC.
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Output Decisions: Revenues, Costs, and Profit Maximization
Comparing Costs and Revenues to Maximize Profit
A Numerical Example
TABLE 8.6 Profit Analysis for a Simple Firm
(1)
q
(2)
TFC
(3)
TVC
(4)
MC
(5)
P = MR
(6)TR
(P x q)
(7)TC
(TFC + TVC)
(8)PROFIT
(TR TC)
0 $ 10 $ 0 $ $ 15 $ 0 $ 10 $ -10
1 10 10 10 15 15 20 -5
2 10 15 5 15 30 25 5
3 10 20 5 15 45 30 15
4 10 30 10 15 60 40 20
5 10 50 20 15 75 60 15
6 10 80 30 15 90 90 0
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© 2009 Pearson Education, Inc. Publishing as Prentice Hall Principles of Economics 9e by Case, Fair and Oster 32 of 32
Output Decisions: Revenues, Costs, and Profit Maximization
Comparing Costs and Revenues to Maximize Profit
A Numerical Example
Case Study in Marginal Analysis: An Ice Cream Parlor
An analysis of fixed costs, variable costs, revenues, profits, and opening longer hours were used by this ice cream parlor to determine whether to stay in business.
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© 2009 Pearson Education, Inc. Publishing as Prentice Hall Principles of Economics 9e by Case, Fair and Oster 33 of 32
Output Decisions: Revenues, Costs, and Profit Maximization
The Short-Run Supply Curve
FIGURE 8.11 Marginal Cost Is the Supply Curve of a Perfectly Competitive Firm
At any market price,a the marginal cost curve shows the output level that maximizes profit. Thus, the marginal cost curve of a perfectly competitive profit-maximizing firm is the firm’s short-run supply curve. a This is true except when price is so low that it pays a firm to shut down—a point that will be discussed in Chapter 9.
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© 2009 Pearson Education, Inc. Publishing as Prentice Hall Principles of Economics 9e by Case, Fair and Oster 34 of 32
average fixed cost (AFC)
average total cost (ATC)
average variable cost (AVC)
fixed cost
homogeneous product
marginal cost (MC)
marginal revenue (MR)
perfect competition
spreading overhead
total cost (TC)
total fixed costs (TFC) or overhead
total revenue (TR)
total variable cost (TVC)
total variable cost curve
variable cost
1. TC = TFC + TVC
2. AFC = TFC/q
3. Slope of TVC = MC
4. AVC = TVC/q
5. ATC = TC/q = AFC + AVC
6. TR = P x q
7. Profit-maximizing level of output for all firms: MR = MC
8. Profit-maximizing level of output for perfectly competitive firms: P = MC
REVIEW TERMS AND CONCEPTS