The demand curves for firms in a purely competitive industry are perfectly elastic.

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In a perfectly competitive industry, there are a large number of firms selling homogeneous products, and each firm is too small to affect the market price. As a result, the demand curve facing each firm is perfectly elastic, which means that the firm can sell as much as it wants at the market price, but if it charges a higher price, it will not sell anything.

The Demand Curves for Firms in a Purely Competitive Industry