FIRM SUPPLY: MARKET STRUCTURE & PERFECT COMPETITION
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1 FIRM SUPPLY: MARKET STRUCTURE & PERFECT COMPETITION
2 Firm Supply How does a firm decide how much to supply at a given price? This depends upon the firm s goals; technology; market environment; and competitors behaviour.
3 Market Environment Are there many other firms? How do other firms decisions effect the firm s payoffs?
4 Market Environment Monopoly: Just one seller that determines the quantity supplied/the market-clearing price. Oligopoly: A very small number of firms, the decision of each influencing the payoffs of the other firms.
5 Market Environment Dominant Firm: Many firms, but one much larger than the rest. The large firm s decisions affect the payoffs of each small firm. Decisions by any one small firm do not noticeably effect the payoffs of any other firm.
6 Market Environment Monopolistic Competition: Many firms each making a slightly different product. Each firm s output level is small relative to the total. Perfect Competition: Many firms, all making the same product. Each firm s output level is very small relative to the total output level.
7 Perfect Competition Assumptions There are many buyers and sellers, each firm is a price-taker Homogeneous product Freedom of entry and exit Perfect information
8 2 Reasons Why Perfect Competition is Important (1) Many markets are reasonably approximated by it. Commodity markets Stock exchanges Retail (some wholesale) (2) Used as a benchmark by which other market structures are judged.
9 Perfect Competition What is the demand curve faced by the firm?
10 P Perfect Competition Market Supply p e Market Demand Q
11 P Perfect Competition p p e p Market Supply At a price of p, zero is demanded from the firm. Market Demand Q At a price of p the firm faces the entire market demand.
12 Perfect Competition Therefore, the demand curve faced by the individual firm is...
13 Perfect Competition P Market Supply P P* P* Market Demand Q q Firm s Demand Curve
14 The Firm s Short-Run Supply Decision? Each firm is a profit-maximizer Each firm choose its output level by solving: max ( q) pq c( q) q 0 What does the solution q* look like?
15 The Firm s Short-Run Supply Decision? ) ( ) ( max 0 q c pq q q (q) q q* 0 ) ( ) ( ) ( q MC p dq q d i * ) ( ) ( q q at dq q d ii F.O.C. S.O.C.
16 The Firm s Short-Run Supply Decision? The first-order maximum profit condition is: d ( q) p MC( q) 0 dq That is, p MC So at a profit maximum with q* > 0, the market price p equals the marginal cost of production at q = q*.
17 The Firm s Short-Run Supply Decision? P p e q MC(q) q* q At q = q*, p = MC and MC slopes upwards, q = q* is profitmaximizing.
18 P The Firm s Short-Run Supply Decision? p e q MC(q) q* At q = q, p = MC and MC slopes downwards, q = q is profitminimizing. q
19 P The Firm s Short-Run Supply Decision? p e q MC(q) q* q So a profitmaximising supply level can lie only on the upwards sloping part of the firm s MC curve.
20 The Firm s Short-Run Supply Decision? But not every point on the upward-sloping part of the firm s MC curve represents a profitmaximum. The firm will choose an output level q > 0 only if p AVC(q)
21 The Firm s Short-Run Supply Decision? The firm will not supply any output if : p AVC(q) Shut Down Point: P = AVC(q)
22 Firm s Short-Run Supply Decision? P MC(q) AC(q) AVC(q) q
23 Firm s Short-Run Supply Decision? P Shutdown point MC(q) AC(q) AVC(q) The firm s short-run supply curve q
24 Short Run Market Supply Curve P S Market Supply Curve is the sum of all the firms supply curves ( MC) nxq=q
25 Firm s Long-Run Supply Decision? The long-run is the circumstance in which the firm can choose amongst all of its short-run circumstances. How does the firm s long-run supply decision compare to its short-run supply decisions?
26 Firm s Long-Run Supply Decision? A competitive firm s long-run profit function is: ( q) pq c( q) The long-run cost c(q) of producing q units of output consists only of variable costs since all inputs are variable in the long-run.
27 Firm s Long-Run Supply Decision? The firm s long-run supply level decision is to maximise, ( q) pq c( q)
28 Firm s Long-Run Supply Decision? Additionally, the firm s economic profit level must not be negative, since the firm would exit the market in that case. Therefore, p ATC(q)
29 Firm s Long-Run Supply Decision? P p > AC(q) MC(q) AC(q) q
30 Firm s Long-Run Supply Decision? P The firm s long-run supply curve MC(q) AC(q) q
31 Application: Tax Incidence In Perfect Competition P P C = P P No tax: P C = P P Market Supply Market Demand Q
32 Application: Tax Incidence P P C Market Supply This is the tax. P P Q Market Demand The tax creates a wedge between the price firms receive and the price consumers pays. The difference is the tax.
33 Application: Tax Incidence P P C Market Supply This is the tax P P Q Market Demand In the short run, the burden of the tax is shared (not necessarily on a 50/50 basis) between consumers and producers.
34 Application: Tax Incidence In the short run, The producers receives less for the product. Some firms will continue to produce output at a loss once they are covering their average variable costs. Some firms will experience losses and so exit the market. The supply curve shifts to the left and the prices consumers and producers face increases.
35 Application: Tax Incidence In the Long Run, Consumers pay all of the tax (100%) Producers pay none of tax (0%) There are no firms making losses
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