Assume that all firms in this industry have identical cost curves, and that the market is perfectly competitive.
If the market supply curve is given by S1, then in the long run firms will:
A. exit the market, leading the market supply curve to shift out to S2.
B. enter the market, leading the market supply curve to shift out to S2.
C. neither enter nor exit the market, so the market supply curve will remain at S1.
D. enter the market, leading the market supply curve to shift out to S3.
Answer: B
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