EC202: Worked Example #3.6 Frank Cowell April 2005

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EC202: Worked Example #3.6 Frank Cowell April 2005 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

WX3.6: part 1

For Q below this get IRTS and vice versa WX3.6: part 1 Total cost: Marginal cost: Average cost: MC intersects AC at: For Q below this get IRTS and vice versa This is where:

WX3.6: part 2 Price at Q is: Price P separates regimes: Identical this portion of MC Price P separates regimes: Exactly two values here Cheaper to close down here

WX3.6: part 2  AC MC P Demand: high a Supply (one firm) Demand: low a Qi P 1 2 3 4 5 6 7 8 9 10 0.5 1.5 AC Demand: high a Supply (one firm)  MC Demand: low a

WX3.6: part 3 Two such firms: extra point half-way between green blobs Four such firms: points at quarter, half, three-quarter positions between blobs. Infinity of these firms: all points between blobs

WX3.6: part 4

WX3.6: part 4 High demand: unique equilibrium on upper part of supply curve Very low demand: equilibrium with zero output. In between: no equilibrium for a single firm?

WX3.6: part 4 If there is equilibrium Supply=Demand gives us Using definition of P: This is only valid if P > P: This yields the condition:

WX3.6: part 5 Equilibrium condition Supply=Demand now gives us Outcome depends on which of three regimes applies to demand, high, medium or low

WX3.6: part 5 High demand Medium demand. Average output per firm is Achieve this by putting a proportion q at Q and 1–q at 0 where Low demand. Output per firm is 0