1. Pure Competition in the Short Run 10 McGraw-Hill/IrwinCopyright © 2012 by The McGraw-Hill Companies, Inc. All rights reserved.

2. Four Market Models Pure competition Pure monopoly Monopolistic competition Oligopoly LO1 Market Structure Continuum Pure Competition Pure Competition Monopolistic Competition Oligopoly Pure Monopoly

3. Pure Competition: Characteristics Very large numbers of sellers Standardized product “Price takers” Easy entry and exit Perfectly elastic demand Firm produces as much or little as they want at the price Due to being price takers LO2

4. Average, Total, and Marginal Revenue Total Revenue TR = P X Q Marginal Revenue Extra revenue from 1 more unit MR = ΔTR/ΔQ LO3

5. Profit Maximization Three questions: Should the firm produce? If so, what amount? What economic profit (loss) will be realized? Features Firm shuts down if P<minAVC If firm produces, produce where MR=MC Can be restated as P=MC LO3

6. Profit Maximization: MR-MC Approach LO3 Table for Figure 8.3 The Profit-Maximizing Output for a Purely Competitive Firm: Marginal Revenue – Marginal Cost Approach (Price = $131) (1) Total Product (Output) (2) Average Fixed Cost (AFC) (3) Average Variable Costs (AVC) (4) Average Total Cost (ATC) (5) Marginal Cost (MC) (5) Price = Marginal Revenue (MR) (6) Total Economic Profit (+) or Loss (-) 0$-100 1$100.00$90.00$190$90$131-59 250.0085.0013580131-8 333.3380.00113.3370131+53 425.0075.00100.0060131+124 520.0074.0094.0070131+185 616.6775.0091.6780131+236 714.2977.1491.4390131+277 812.5081.2593.75110131+298 911.1186.6797.78130131+299 1010.0093.00103.00150131+280

7. 3 Production Questions LO3 Table 8.3 Output Determination in Pure Competition in the Short Run QuestionAnswer Should this firm produce?Yes, if price is equal to, or greater than, minimum average variable cost. This means that the firm is profitable or that its losses are less than its fixed cost. What quantity should this firm produce?Produce where MR (=P) = MC; there, profit is maximized (TR exceeds TC by a maximum amount) or loss is minimized. Will production result in economic profit? Yes, if price exceeds average total cost (TR will exceed TC). No, if average total cost exceeds price (TC will exceed TR).

8. Firm and Industry: Equilibrium LO4 Table 8.4 Firm and Market Supply and the Market Demand (1) Quantity Supplied, Single Firm (2) Total Quantity Supplied, 1000 Firms (3) Product Price (4) Total Quantity Demanded 1010,000$1514,000 99,0001316,000 88,0001118,000 77,000919,000 66,0008111,000 007113,000 006116,000