1. Unit 4: Imperfect Competition 1

2. Memorizing vs. Learning 12-35711131-71923 Try memorizing the above number How effective is memorizing it? The point: If you try to MEMORIZE all the graphs of economics you will forget them. You must LEARN them!

3. 4 Market Structures 3

4. Perfect Competition Pure Monopoly Monopolistic Competition Oligopoly FOUR MARKET STRUCTURES Every product is sold in a market that can be considered one of the above market structures. For example: Fast Food Market The Market for Cars Market for Operating Systems (Microsoft) Strawberry Market Cereal Market Pure Monopoly Monopolistic Competition Oligopoly Imperfect Competition 4

5. Monopoly 5

6. Characteristics of Monopolies 6

7. 5 Characteristics of a Monopoly 1.Single Seller One Firm controls the vast majority of a market The Firm IS the Industry 2. Unique good with no close substitutes 3. “Price Maker” The firm can manipulate the price by changing the quantity it produces (ie. shifting the supply curve to the left). Ex: California electric companies 7

8. 5. Some “Nonprice” Competition 4. High Barriers to Entry No immediate competitors Despite having no close competitors, monopolies still advertise their products in an effort to increase demand. 5 Characteristics of a Monopoly New firms CANNOT enter market Firm can make profit in the long-run 8

9. Examples of Monopolies 9

10. What do you already know about monopolies? True or False? 1.All monopolies make a profit. 2.Monopolies are usually efficient. 3.All monopolies are bad for the economy. 4.All monopolies are illegal. 5.Monopolies charge the highest price possible 6.The government never prevents monopolies from forming. 10

11. 11

12. Four Origins of Monopolies 1.Geography is the Barrier to Entry Ex: Nowhere gas stations, De Beers Diamonds, San Diego Chargers, Cable TV, Qualcomm Hot Dogs… -Location or control of resources limits competition and leads to one supplier. 2. The Government is the Barrier to Entry Ex: Water Company, Firefighters, The Army, Pharmaceutical drugs, rubix cubes… -Government allows monopoly for public benefits or to stimulate innovation. -The government issues patents to protect inventors and forbids others from using their invention. (They last 20 years) 12

13. Four Origins of Monopolies 3. Technology or Common Use is the Barrier to Entry Ex: Microsoft, Intel, Frisbee, Band-Aide… -Patents and widespread availability of certain products lead to only one major firm controlling a market. 4. Mass Production and Low Costs are Barriers to Entry Ex: Electric Companies (SDGE) If there were three competing electric companies they would have higher costs. Having only one electric company keeps prices low -Economies of scale make it impractical to have smaller firms. Natural Monopoly- It is NATURAL for only one firm to produce because they can produce at the lowest cost. 13

14. Drawing Monopolies 14

15. Good news… 1.Only one graph because the firm IS the industry. 2.The cost curves are the same 3.The MR= MC rule still applies 4.Shut down rule still applies 15

16. The Main Difference Monopolies (and all Imperfectly competitive firms) have downward sloping demand curve. Which means, to sell more a firm must lower its price. This changes MR… THE MARGINAL REVENUE DOESN’T EQUAL THE PRICE! 16

17. D Combine the Demand of an industry with the costs of a firm. Quantity ATC MC What about MR? 17 Price

18. D Combine the Demand of an industry with the costs of a firm. Quantity ATC MC MR 18 Price

19. PQdTRMR $1100- Why is MR less than Demand? 19

20. $10 PQdTRMR $1100- $10110 Why is MR less than Demand? 20

21. $10 PQdTRMR $1100- $10110 $92188 Why is MR less than Demand? $9 21

22. $10 PQdTRMR $1100- $10110 $92188 $83246 Why is MR less than Demand? $9 $8 22

23. $10 PQdTRMR $1100- $10110 $92188 $83246 $74284 Why is MR less than Demand? $9 $8 $7 23

24. $10 PQdTRMR $1100- $10110 $92188 $83246 $74284 $65302 Why is MR less than Demand? $9 $8 $7 $6 $7 $6 24

25. $10 PQdTRMR $1100- $10110 $92188 $83246 $74284 $65302 $56300 Why is MR less than Demand? $9 $8 $7 $6 $7 $6 $5 25

26. $10 PQdTRMR $1100- $10110 $92188 $83246 $74284 $65302 $56300 $4728-2 Why is MR less than Demand? $9 $8 $7 $6 $7 $6 $5 $4 26

27. $10 PQdTRMR $110-- $10110 $92188 $83246 $74284 $65302 $56300 $4728-2 Why is MR less than Demand? $9 $8 $7 $6 $7 $6 $5 $4 27

28. $10 PQdTRMR $110-- $10110 $92188 $83246 $74284 $65302 $56300 $4728-2 Why is MR less than Demand? $9 $8 $7 $6 $7 $6 $5 $4 MR IS LESS THAN PRICE 28

29. 1 2 3 4 5 6 7 P Q D MR Why is MR below Demand? 29 $10 9 8 7 6 5 4 3 2 1

30. 1 2 3 4 5 6 7 P Q D MR Why is MR below Demand? 30 $10 9 8 7 6 5 4 3 2 1 At price $10, TR = $10 When price falls to $9, MR =$8 What happens to MR when price falls to $8?

31. 1 2 3 4 5 6 7 P Q D MR Why is MR below Demand? 31 $10 9 8 7 6 5 4 3 2 1 At price $10, TR = $10 When price falls to $9, MR =$8 What happens to MR when price falls to $8? MR CURVE IS LESS THAN DEMAND CURVE!!!

32. Calculating Marginal Revenue 32

33. Calculate TR and Marginal Revenue QuantityPriceTRMR 0$16 115 214 313 412 511 610 79 88 97 6 33

34. QuantityPriceTRMR 0$160 115 21428 31339 41248 51155 61060 7963 8864 9763 10660 Calculate TR and Marginal Revenue 34

35. QuantityPriceTRMR 0$160- 115 2142813 3 3911 412489 511557 610605 79633 88641 9763 10660-3 Calculate TR and Marginal Revenue 35

36. QuantityPriceTRMR 0$160- 115 2142813 3 3911 412489 511557 610605 79633 88641 9763 10660-3 Calculate TR and Marginal Revenue 36

37. Plot the Demand, Marginal Revenue, and Total Revenue Curves 37 Q $15 10 5 $64 40 20 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 Q TR P

38. Q $15 10 5 $64 40 20 TR D 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 Q MR Demand and Marginal Revenue Curves What happens to TR when MR hits zero? Total Revenue is at it’s peak when MR hits zero 38 P TR

39. Elastic vs. Inelastic Range of Demand Curve 39

40. Elastic and Inelastic Range 40 Q $15 10 5 $64 40 20 TR D 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 Q MR P TR Total Revenue Test If price falls and TR increases then demand is elastic. Elastic Total Revenue Test If price falls and TR falls then demand is inelastic. A monopoly will only produce in the elastic range Inelastic

41. Maximizing Profit 41

42. D MR $9 8 7 6 5 4 3 2 MC ATC 42 1 2 3 4 5 6 7 8 9 10 Q P What output should this monopoly produce? MR = MC How much is the TR, TC and Profit or Loss? Profit =$6

43. D $9 8 7 6 5 4 3 2 Conclusion: A monopolists produces where MR=MC, buts charges the price consumer are willing to pay identified by the demand curve. MC ATC 43 1 2 3 4 5 6 7 8 9 10 Q P MR

44. D $10 9 8 7 6 5 4 3 MC ATC 44 6 7 8 9 10 Q P TR= $90 TC= $100 Loss=$10 AVC What if cost are higher? How much is the TR, TC, and Profit or Loss?

45. D MC MR TR= TC= Profit/Loss= Profit/Loss per Unit= Identify and Calculate: $70 $14 $56 ATC $2 45 $10 9 8 7 6 5 4 1 2 3 4 5 6 7 8 9 10 Q P

46. Are Monopolies Efficient? 46

47. Q P D S = MC P pc Q pc CS PS 47 In perfect competition, CS and PS are maximized. Monopolies vs. Perfect Competition

48. At MR=MC, A monopolist will produce less and charge a higher price 48 Monopolies vs. Perfect Competition Q P D S = MC P pc Q pc MR PmPm QmQm

49. Where is CS and PS for a monopoly? 49 Monopolies vs. Perfect Competition Q P D S = MC MR PmPm QmQm CS PS Total surplus falls. Now there is DEADWEIGHT LOSS Monopolies underproduce and over charge, decreasing CS and increasing PS.

50. Are Monopolies Productively Efficient? Does Price = Min ATC? No. They are not producing at the lowest cost (min ATC) 50 D $9 8 7 6 5 4 3 2 MC ATC 1 2 3 4 5 6 7 8 9 10 Q P MR

51. Are Monopolies Allocatively Efficiency? Does Price = MC? No. Price is greater. The monopoly is under producing. 51 D $9 8 7 6 5 4 3 2 MC ATC 1 2 3 4 5 6 7 8 9 10 Q P MR Monopolies are NOT efficient!

52. Monopolies are inefficient because they… 1.Charge a higher price 2.Don’t produce enough Not allocatively efficiency 3.Produce at higher costs Not productively efficiency 4.Have little incentive to innovate Why? Because there is little external pressure to be efficient 52

53. Q DMR MC ATC P Natural Monopoly 53 Q socially optimal One firm can produce the socially optimal quantity at the lowest cost due to economies scale. It is better to have only one firm because ATC is falling at socially optimal quantity

54. Lump Sum vs. Per Unit Taxes and Subsidies 54 ACDC Econ Video

55. 2007 FRQ #1