1. Review Exercise (1) #3, p.344 PRGE True or False? A profit maximizaing monopoly faces a demand with constant price elasticity of -2. His marginal cost is also constant at 20$. If his marginal cost rises by 25%, the price he charges will also rise by 25%.

2. Review Exercise (1) #3, p.344 PRGE P M 0 = MC 0 /(1+1/E D ) = 20$/(1-1/2) = 40$ MC 1 = (1+0.25)* MC 0 = 25$ P M 1 = MC 1 /(1+1/E D ) = 25$/(1-1/2) = 50$ ∆% P M ?= (P M 1 - P M 0 )/ P M 0 = (50$-40$)/40$=... 10$/40$=25% MC ∆ ↑25%  P M ∆ ↑25% TRUE

3. Review Exercise (2) True or False? A monopoly nerver produces in the inelastic part of the demand curve.

4. Review Exercise (2) True or False? A monopoly nerver produces in the inelastic part of the demand curve. In the inelastic part of the demand curve, by raising the price the monopoly generates higher revenues because the corresponding fall in the quantity demanded is proportionally smaller. Furthermore, the drop in quantity implies a fall in costs. ↑ revenus & ↓ coûts = ↑profits. The producer would never maintain a level of production in the inelastic part of the demand curve. TRUE

5. Review Exercise (3) #18 a) et b) p.346 PRGE Profit maximizing monopoly; Q = 144 / P 2 CF=5 CVM=Q 1/2 a) P M ? Q M ? Profits M ? b) What happens if the government imposes a price ceiling of 4$?

6. Review Exercise (3) a) MR? D: Q=144/P 2 → P 2 =144/Q → P=12/Q 1/2 Rev = P*Q = (12/Q 1/2 )*Q = 12 Q 1/2, MR = dRev / dQ = 6/Q 1/2 MC? = dCT / dQ = dVC / dQ VC? AVC=VC/Q  VC=AVC*Q VC= Q 1/2 *Q = Q 3/2 MC = dQ 3/2 / dQ = 3/2*Q 1/2

7. Review Exercise (3) a) MR = MC 6/Q 1/2 = 3/2*Q 1/2, 6 = 3/2*Q 12/3 = Q M = 4 P M ? D(Q M )=12/(Q M ) 1/2 = 12/2 = 6 = P M Profits? (P M *Q M) – C(Q M ) (6$*4) – (4 3/2 $ + 5$) 24$ - 13$ = 11$ = π M

8. Review Exercise (3) b) The State fixes a price ceiling at 4$. D: Q = 144/P 2 = 144/16 = 9 = Q GOUV Profits = (4$*9) – (9 3/2 + 5$) = 36$ - 27$ - 5$ = 4$

9. PMPM QMQM P GOUV Q GOUV MCMRAC

10. Pricing strategies

11. Introduction Why do student discounts exist? Why is a firm like Costco profitable? Why is it that your neighbor on the plane likely has not paid the same price as you for his plane ticket?

12. Example: nightclub Population: 100 men, each willing to pay 10$ 100 women, each willing to pay 5$ What should the club’s cover charge be? (MC = 0) If p = 10$, who will buy? π = ? If p = 5$, same questions. How can the club do better?

13. A possible solution Price discrimination (PD) : Charge different people different prices for the same product. Nightclub example: charge 5$ for women charge 10$ for men  π = __________

14. Who can practice PD? 3 necessary conditions, on: the ability to choose your selling price the information about potential customers the customers’ ability to resell the product Explain in detail.

15. Perfect PD (1st degree) Def:Charge each consumer his willingness to pay p Q D 1 2 3 4 1 234 MC Ex: Cupcake stand MC ≡ $1.50 apiece (constant) Who will buy a cupcake? How much will each person pay? What will profits be? Ali Ben Cat Dave

16. More generally, for a larger population. p D S Ex: D : p = 40 - Q S : MC = Q How many units will be sold? Compute CS, PS and W. Compare with:- Competition - Traditional Monopoly 40 Q Perfect price discrimination (cont.)

17. Interpretations : Is perfect PD efficient? Is it fair? Is it realistic? Give examples of markets approaching perfect price discrimination. Perfect price discrimination (end)

18. Explicit market segmentation (3rd degree PD) Def.:Consumers can be differentiated according to an observable characteristic Examples : _________________________________ ….

19. Example :Levi’s 501 jeans in Europe (E) and in North America. ( MC ≡ $5 apiece ) p DEDE 45 4500 QEQE p D NA 35 7000 Q NA MC 5 5 Explicit market segmentation (cont.)

20. What will the price be on each continent? Give an interpretation in terms of price- elasticity? Explicit market segmentation (end)

21. Def.:Consumers are discriminated according to an unobservable characteristic: their own preferences  Price menus, block pricing Examples : _________________________________ …. Implicit market segmentation (2 nd degree PD)

22. Example:Cell-phone plan (MC ≡ 10 ¢/mn) Plan 1: 200 mn for 40 $/month Plan 2: 400 mn for 70 $/month Plan 3: 600 mn for 90 $/month Two types of consumers: Type 1: q 1 = 650 - 20p Type 2: q 2 = 550 - 20p Which plan will each type of consumer choose? Implicit market segmentation (cont.)

23. Type 1 Consumers Chooses plan 2 b/c C > D CS: A+B+C-D PS: E+H+F+G+I+J

24. Type 2 Consumers Chooses plan 1 b/c G > H CS: A-B PS: C+D+B+E+F

25. Monopoly pricing (no discr.)

26. What pricing schedule does this plan menu correspond to? In other words, what is the per-minute price of the first 200mn? What is the per-minute price of the next 200mn? (from 200 to 400) What is the per-minute price for the last 200mn? (from 400 to 600) p Q 10 15 20 600400200 Draw the price « line » Implicit market segmentation (cont.)

27. Type 1 consumer: d 1 : q 1 = 650 – 20p Which plan will she choose? Why? Show CS 1 and PS 1 graphically. p d1d1 25 Q MC 10 15 20 600400200 Implicit market segmentation (cont.) 30

28. Type 2 consumer: d 2 : q 2 = 550 – 20p Which plan will she choose? Why? Show CS 2 and PS 2 graphically. p d2d2 25 Q MC 10 15 20 600400200 Implicit market segmentation (cont.) 30

29. Exercise: Consider a population of 100 consumers of each type Compute the consumer surplus, producer surplus and total welfare for this entire population Compare with the traditional monopoly. [Hint: First draw the demand curve of the entire population] *Implicit market segmentation (end)

30. Conclusions Several types of price discrimination: perfect (or 1st degree) explicit segmentation (or 3rd degree PD) implicit segmentation (or 2 nd degree PD) Price discrimination is everywhere! Look for more examples around you. Next: Competition and strategic interactions