Presentation on theme: "1 5--MONOPOLY G406, Regulation, Eric Rasmusen, October 1, 2013."— Presentation transcript:
1 5--MONOPOLY G406, Regulation, Eric Rasmusen, October 1, 2013
MR = MC 2 What does this mean?
Pricing with Market Power 3 The simplest case is when the seller has zero marginal cost. Then its task is to set MR = 0, which means to maximize revenue. Why not lower all the prices if you arent filling up the football stadium? Note the market failure: some seats were wasted.
Pricing with Market Power 4
Linear Demand and Marginal Revenue 5 We often use linear (straight line) demand curves in diagrams. When demand is linear, marginal revenue is linear too, with twice as steep a slope. Calculus makes this easy to see. If demand is P = a -bQ, then revenue is R = PQ = (a - bQ)Q = aQ – bQ^2, and marginal revenue is MR=dR/dQ = a - 2bQ, just like demand but with a 2 so it slopes down twice as fast. (I use the notation Q^2 here to mean Q*Q, that is, Q squared.)
Drawing Marginal Revenue 6 In drawing, remember that if the demand curve hits the Quantity axis at Q = 10, then the marginal revenue curve hits it at Q = 5. Also, though quantity demanded is 0 for bigger quantities than 10, the marginal revenue curve keeps going negative, because revenue can certainly decline as output increases.
The Cournot Model 7
Profits As Output Rises 8
One Firm: A Monopoly 9
Asymmetric Cournot Duopoly 10
The Reaction Curve 11
Asymmetric Reaction Curves 12
Firm 2 13
Firm 2s Reaction Function 14
Equilibrium Outputs 15
Symmetric Cournot Duopoly 16
The Symmetric Reaction Curves 17
Three Firms or More 19
Output with N Firms 20
Reaction Planes3 Firms 21
N-Firm Outputs 22
The Lerner Rule I 23 Thus, if the quantity demanded falls by 20% when the price rises by 10%, the elasticity of demand is -2.
The Lerner Rule II 24 (old slide) (new on this slide) (old slide)
The Lerner Rule III 25 MC =100, Elasticity =-2, then P = (-2/(-2+1)(100)= (2)(100)=200. and (P – MC)/P = - 1/(-2) = ½. Elasticity =-3, then P = (-3/(-3+1)(100)= (1.5)(100)=150. and (P – MC)/P = - 1/(-3) = 1/3. The Lerner Rule only applies if demand is elastic. What should the firm do if demand is inelastic?
Price Fixing 26 The two most common kinds of illegal monopolizing cases involve: (a)industries for homogeneous products that have few sellers, (b) bidders in auctions, whether auctions to sell objects where the high bid wins or auctions for procurement contracts where the low bid wins. ).
Harberger Triangles I 30 Another source of hope comes from something discovered by Arnold Harberger in 1954: Triangles are smaller than rectangles. Harberger started by assuming that any 1924–28 manufacturing industry with accounting profit rates above average was earning monopoly profits Furniture earned a 14% return on capital, 2% more than average, so Harberger took its price to be 2% over marginal cost.
Harberger Triangles II 31 From last slide: Price is 2% over marginal cost (draw a triangle on the board) He used -1 as the elasticity of demand, and calculated that sales were 2% less than the optimum, so the triangle loss of.5 (2) (2) was 2% of furniture sales. He did this for all manufacturing, and came up with a welfare loss of 1/10 of one percent of GDP.
Harberger Triangle Diagram 32 Suppose half of the economy is monopolized so prices rise 20%. Suppose the elasticity of demand for that half of the economy is -1. The triangle is.5(.2)(.2)(.5) of GDP, 1% of GDP, 140 billion dollars.
Does Macro Matter More? 33
Prof. Taylors Comparison 34
Slides after this point probably wont be used in class 35
The Limits of Monopoly Caterpillar Inc. closed a 62-year-old locomotive plant in London, Ontario eliminating 450 manufacturing jobs that mostly paid twice US wages.Caterpillar Caterpillar's decision, ending a standoff with locked-out workers huddled around barrels of burning scrap wood outside the London factory gates, may benefit another downtrodden manufacturing city: Muncie, Ind., where Caterpillar last year opened a locomotive plant and where it is trying to fill jobs at about half the pay workers in Ontario received. At a job fair in Muncie Saturday, Caterpillar will be offering jobs at that plant at wages ranging from $12 to $18.50 per hour. Wages for most workers at the Ontario plant are about 35 Canadian dollars an hour (US$35.03). 36
Everet v. Williams (1725) It recites an oral partnership between the defendant and the plaintiff, who was 'skilled in dealing in several sorts of commodities;' and that the parties had 'proceeded jointly in the said dealings with good success on Hounslow Heath, where they dealt with a gentleman for a gold watch'... Further recitals show how the parties accordingly 'dealt with several gentlemen for divers watches, rings, swords, canes, hats, cloaks, horses, bridles, saddles, and other things to the value of 200 pounds... and that the defendant would not come to a fair account with the plaintiff touching and concerning the said partnership. 37
The Highwaymens Case Whereas, by an order of this Court, made the 29th day of November last, the tipstaff was ordered to take into his custody and bring into this Court William White and William Wreathock the plaintiff's solicitors in this cause --- reflecting upon the honour and dignity of this Court;... this Court upon consideration had of the premises, doth fyne the said William White 50 pounds, and the said William Wreathock 50 pounds, and commit them to the custody of the Warden of the Fleet until they pay the said fynes. The defendant was executed 2 years later, and the plaintiff 5 years later. 38
Thomas v. UBS (Posner, J.) Our plaintiffs... argue... that the bank should have prevented them from violating the law. This is like suing ones parents to recover tax penalties one has paid, on the ground that the parents had failed to bring one up to be an honest person who would not evade taxes and so would not subject himself to penalties. wAr Curr 39
Thomas II We neednt discuss the plaintiffs remaining claimsof negligence and malpracticeas they are frivolous squared. This lawsuit, including the appeal, is a travesty. We are surprised that UBS hasnt asked for the imposition of sanctions on the plaintiffs and class counsel. 40