Question
Under perfect competition, the firm's demand curve is
typically perfectly elastic. However, under certain conditions, it may become negatively sloped. What is the most plausible reason for this change?Solution
Under perfect competition, a firm's demand curve is perfectly elastic. However, if the market structure shifts towards monopolistic competition, the firm's demand curve may become negatively sloped. This is because in monopolistic competition, firms differentiate their products, giving them some market power and allowing them to face a downward-sloping demand curve.

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