EC202: Worked Example #3.4 Frank Cowell April 2003 This presentation covers exactly the material set out in the file WorkedExamples.pdf, but with the addition.

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EC202: Worked Example #3.4 Frank Cowell April 2003 This presentation covers exactly the material set out in the file WorkedExamples.pdf, but with the addition of a few graphics and comments To start the presentation select Slideshow\View Show or click on icon below left. Mouse click or [Enter] to advance through slide show

WX3.4: Monopoly and competition Part 1: Competition

WX3.4: Find Firm’s Supply Curve Integrate MC in the question to get total costs Divide by Q to get average costs Differentiate to find minimum AC at Where average costs are: Given a price can then find output from supply curve

WX3.4: The Firm’s Supply Curve Q Q P average cost a+bQ marginal cost F/Q+a+0.5bQ P - a —— b Q*= P supply curve

WX3.4: Monopoly and competition Part 2: Unregulated monopoly

WX3.4: Find monopolist’s equilibrium Given the demand curve (AR), total revenue is So, MR is FOC for the monopolist (MR=MC) is Solving for Q we get And from this we have

WX3.4: Monopolist’s equilibrium F/Q+a+0.5bQ Q average revenue average cost a+bQ marginal cost A - 0.5bQ P Q** P** c** marginal revenue A - bQ

WX3.4: Monopoly and competition Part 3: Regulated monopoly

WX3.4: Introduce price ceiling A price ceiling alters the effective demand curve So AR is now: Multiply by Q and then differentiate to get MR: Note that MR is discontinuous, exactly where AR is kinked Effect of price ceiling depends on position of MC relative to this discontinuity

WX3.4: effect of high price ceiling Q marginal revenue average revenue marginal cost P Q** P** c** P max Q0Q0 (Output unchanged)

WX3.4: effect of low price ceiling Q marginal revenue average revenue marginal cost P Q** P** c** P max Q0Q0 (Output falls)

WX3.4: effect of intermediate price ceiling Q marginal revenue average revenue marginal cost P Q** P** c** P max Q0Q0 (Output rises to Q 0 )

WX3.4: intermediate price ceiling (2) Q marginal revenue average revenue marginal cost P Q** P** c** P max Q0Q0 (Output rises)

WX3.4: Points to remember Make good use of a helpful diagram to “see” the problem Re-use the solution to one part of the problem to build the next. Don’t be fazed by the presence of a discontinuity – everything is nice and regular either side of it.