In perfect competition,the demand curve facing a firm is a horizontal line at the market price because

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In a perfectly competitive market, firms are price takers and have no control over the market price. They must accept the price determined by the market and adjust their quantity supplied accordingly. As a result, the demand curve facing a firm is a horizontal line at the market price. This is because any increase in price above the market price will result in no sales as buyers will shift to other firms offering the same product at a lower price. Similarly, any decrease in price below the market price will result in increased demand but at a lower price, resulting in lower revenues. Therefore, the demand curve facing a perfectly competitive firm is perfectly elastic, or horizontal, at the market price.

In Perfect Competition,the Demand Curve Facing a Firm Is a Horizontal