24. In the long run, after the demand shift to D2, the industry supply curve shifts to S2. This is due to:
- An increase in the cost of an input.
- Firms leaving the industry due to the fact that firms were operating
at a loss.
- Firms leaving the industry due to the fact that firms were earning
positive economic profits.
- Firms entering the industry due to the fact that firms were earning
positive economic profits.
- Firms entering the industry due to the fact that firms were operating
at a loss.
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