In the short run,we assume that the number of firms in a perfectly competitive market:

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In the short run, the number of firms in a perfectly competitive market is usually assumed to be fixed. This is because new firms cannot easily enter or exit the market due to various factors such as limited resources, high barriers to entry, and the time required to set up operations. As a result, any change in demand or supply conditions in the short run is likely to affect the market price, quantity supplied, and profits of existing firms, rather than the number of firms in the market.

In the Short Run,we Assume That the Number of Firms