In theory,the long-run supply curve for perfectly competitive market firms who are identical is:

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In a perfectly competitive market, firms are identical and there are no barriers to entry or exit. This means that in the long run, new firms can enter the market if there are profits to be made, and existing firms can exit if there are losses. As a result, the number of firms in the market can adjust to changes in demand, and the long-run supply curve for firms is perfectly elastic. This means that firms are willing and able to supply any quantity of output at the market price, as they do not have any market power to influence the price. Therefore, the correct answer is A, the long-run supply curve for perfectly competitive market firms who are identical is perfectly elastic.

In Theory,the Long-Run Supply Curve for Perfectly Competitive Market Firms