a competitive market with identical firms, Group of answer choices an increase in demand in the short run will result in a new price above the minimum of average total cost, allowing firms to earn a positive economic profit in both the short run and the long run.   firms cannot earn positive economic profit in either the short run or long run.   firms can earn positive economic profit in the long run if the long-run market supply curve is upward sloping.   free entry and exit into the market requires that firms earn zero economic profit in the long run even though they may be able to earn positive economic profit in the short run.

Microeconomic Theory
12th Edition
ISBN:9781337517942
Author:NICHOLSON
Publisher:NICHOLSON
Chapter12: The Partial Equilibrium Competitive Model
Section: Chapter Questions
Problem 12.4P
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In a competitive market with identical firms,
Group of answer choices
an increase in demand in the short run will result in a new price above the minimum of average total cost, allowing firms to earn a positive economic profit in both the short run and the long run.
 
firms cannot earn positive economic profit in either the short run or long run.
 
firms can earn positive economic profit in the long run if the long-run market supply curve is upward sloping.
 
free entry and exit into the market requires that firms earn zero economic profit in the long run even though they may be able to earn positive economic profit in the short run.
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