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long-run equilibrium diagram

Using diagrams for both the industry and a representative firm, illustrate competitive long-run equilibrium. Assume constant costs. Given the change indemand in the diagram on the left, show how this affects the representative firm. (draw line)

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Answer #1

When the demand curve shifts, equilibrium point shifts from A to B. When there is an increase in demand, then the equilibrium prices rise. As a result, in a competitive market, the Marginal revenue curve shifts up to MR'

With the constant cost, we find new equilibrium at point where MR' = MC. The quantity increases from X to X' and there is profit.
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