24. In the long run, after the demand shift to D₂, the industry supply curve shifts to S₂. This is due to:

1. An increase in the cost of an input.
2. Firms leaving the industry due to the fact that firms were operating at a loss.
3. Firms leaving the industry due to the fact that firms were earning positive economic profits.
4. Firms entering the industry due to the fact that firms were earning positive economic profits.
5. Firms entering the industry due to the fact that firms were operating at a loss.

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