1. AP Microeconomics 12:2 Warm Up: What are the four main market structures? How would you describe the products in each one?

5. Perfect Competition & Monopoly Compared (1) Perfectly competitive firms are Price- _______________; which means And P = MR Monopoly firms are Price - _____________________; which means Therefore, P ≠ MR!! Having power in a market means firms can change price and still make profit! Firms can acquire power in imperfectly competitive markets if they can consistently price their goods in excess of marginal costs. TAKERS No one firm has price control in the market MAKERS The one firm is the only provider; total price control

6. Perfect Competition & Monopoly Compared (2) A perfectly competitive firm’s [output] demand curve is A perfectly competitive firm’s [output] supply curve is A monopoly firm has NO _________________ curve because they are both the industry and the firm. A monopoly firm’s ___________________ curve dictates the both the quantity supplied and demanded at each price. the constant MR curve; perfectly elastic the firm’s MC curve at all prices above the min. point on the AVC curve SUPPLY DEMAND

7. Perfect Competition & Monopoly Compared (3) The demand curve of firms in both monopolies and perfect competition are (4) Marginal cost curves and average cost curves are the same shape in both market structures: (5) The optimal level of production for ALL firms occurs when MR = MC. Negative, and downward sloping Increasing in the short run To find Q (output) always look for

8. Monopoly Power 1.Market Share Measured by the Herfindahl Index This measures the size of firms in relationship to the industry and an indicator of the amount of competition among them 2. Pricing Measured by the Lerner Index Describes a monopoly’s price power L = (P – MC) P The greater the value, the greater the price power. In perfect competition, where P = MC, Lerner index is zero; no market power. 2 Forms: ways to measure a firm’s power

9. Monopolies Monopoly demand curves are downward sloping to the right implying that P>MR and a pricing strategy ensues. The monopolist determines price and output (optimal or best) at the intersection of MR and MC. So in order to induce more sales (increasing total revenue) monopolists will lower price (if the product is relatively elastic).

10. MONOPOLY REVENUES & COSTS Quantity of Output Price (average revenue) Total Revenue Marginal Revenue Average Total Cost Total CostMarginal Cost Profit + Or Loss - 0$172$0 -- $100 -- 1162 $190 190 2152304 135 270 3142426 113.33 340 4132528 100 400 5122610 94 470 6112672 91.67 550 7102714 91.43 640 892736 93.73 750 982738 97.78 880 1072720 103 1030

11. MONOPOLY REVENUES & COSTS Quantity of Output Price (average revenue) Total Revenue Marginal Revenue Average Total Cost Total CostMarginal Cost Profit + Or Loss - 0$172$0 -- $100 -- 1162 $162$190 190 2152304 142135 270 3142426 122113.33 340 4132528 102100 400 5122610 8294 470 6112672 62 91.67 550 7102714 4291.43 640 892736 2293.73 750 982738 297.78 880 1072720 -18103 1030

12. MONOPOLY REVENUES & COSTS Quantity of Output Price (average revenue) Total Revenue Marginal Revenue Average Total Cost Total CostMarginal Cost Profit + Or Loss - 0$172$0 -- $100 -- 1162 $162$190 190 $90 2152304 142135 270 80 3142426 122113.33 340 70 4132528 102100 400 60 5122610 8294 470 70 6112672 62 91.67 550 80 7102714 4291.43 640 90 892736 2293.73 750 110 982738 297.78 880 130 1072720 -18103 1030 150

13. MONOPOLY REVENUES & COSTS Quantity of Output Price (average revenue) Total Revenue Marginal Revenue Average Total Cost Total CostMarginal Cost Profit + Or Loss - 0$172$0 -- $100 ---$100 1162 $162$190 190 $90-28 2152304 142135 270 8034 3142426 122113.33 340 7086 4132528 102100 400 60128 5122610 8294 470 70140 6112672 62 91.67 550 80122 7102714 4291.43 640 9074 892736 2293.73 750 110-14 982738 297.78 880 130-142 1072720 -18103 1030 150-310

14. 12:3 Identify The Market Structures of the following Products:

15. MONOPOLY REVENUES & COSTS Dollars $200 150 200 50 $750 500 250 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 Q Q

16. MONOPOLY REVENUES & COSTS Dollars $200 150 200 50 $750 500 250 MR Elastic 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 D Q TR Q

17. MONOPOLY REVENUES & COSTS Q Dollars $200 150 200 50 $750 500 250 TR MR D InelasticElastic 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 Q

18. Underneath Graphs: When the demand for the product is ELASTIC, the monopolist should lower prices to raise TR. When the demand for the product is INELASTIC, the monopolist should raise prices to raise TR.

19. How Do Monopolists Determine Profit? Price & Cost Quantity Demand MR MC ATC Find Where MC = MR to determine quantity QXQX At that Quantity is also the quantity demanded and thus price PXPX The revenue earned from the q.d. determines the profit above ATC Profit Downward sloping demand curve, whatever is demanded the monopolist will supply The MR curve should hit the x- axis at the demand curves Mid-Point

20. How do Monopolists Determine Profit? Look For: #1: Where MC = MR (optimal point of production, therefore quantity supplied) #2: That quantities intersection with both the demand curve and ATC curve #3: Price on Demand Curve & Price on ATC curve Monopolists realize profits and set price where MC = MR and P > MR!!!

21. Contrasts to Perfect Competition 1.Output is restricted 2.Price is higher 3.Output is lower, which leads to: 4.Misallocation of resources

22. Contrasts to Perfect Competition 5.Reduction of Consumer Surplus {Review of Consumer Surplus: marginal utility is greater than price and people who are willing to pay higher than the market price for a good “save” money} Looks Like: Price Quantity S D PXPX Consumer Surplus Producer Surplus

23. Contrasts to Perfect Competition 6. Monopolists receive a rent {receives more than contributes to production} 7. Accruement of dead- weight loss {wasted resources}

24. Q D MR MC ATC P Q1Q1 Price and Costs P1P1 Profit Consumer Surplus Wasted Resources Dead weight loss; monopolists do not have to conserve resources!! They have no competition Costs

25. Therefore, Monopolies are powerful but are likely to show inefficiencies!!! Q D MR MC ATC P Price and Costs MR = MC Monopolists Price Fair-Return Price Normal Profit Only Socially-Optimum Price QmQm QfQf QsQs PmPm PfPf PsPs Dilemma of Regulation: Which Price?

26. Is there a need for government to regulate this market structure?