It's easy to determine if a firm is making long-run production decisions by looking at its cost structure because, in the long run, a firm does not have any:

Question

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In the long run, a firm has the flexibility to adjust all factors of production, including fixed costs such as rent, salaries, and depreciation. Therefore, if a firm is making long-run production decisions, it does not have any fixed costs that are unchangeable or sunk. It may still have variable costs and opportunity costs, but those can be adjusted in the long run.

It's Easy to Determine If a Firm Is Making Long-Run