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Demand curve in a perfect competition
Hello,
In a perfect competition, I know that that the demand curve facing a firm in a competition is a horizontal line whereas the demand curve facing a market is a line with negative slope. How is this mathematically possible? Isn't the aggregate demand curve of the market equal to the sum of demand curves of the firms? If all the firms have a horizontal line as the demand curve, how can the sum be a line with a negative slope?
Thanks!
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