For a firm in a perfectly competitive industry, the demand curve for its own product is

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In a perfectly competitive industry, a firm faces a perfectly elastic demand curve at the market price, meaning the demand curve for its own product is horizontal. This implies that the marginal revenue, which is the additional revenue from selling one more unit, is equal to the price for all units sold. Therefore, the demand curve is the same as the marginal revenue curve.

For a Firm in a Perfectly Competitive Industry, the Demand