Why does a local McDonald's face a downward-sloping demand curve for its Quarter Pounder? Part 2 In monopolistically competitive markets, Part 3 A. changing the price affects the quantity sold because firms are price takers. B. changing the price affects the quantity sold because firms sell differentiated products. C. changing the price does not affect the quantity sold because firms have market powerfirms have market power. D. changing the price does not affect the quantity sold because firms are price makersfirms are price makers. E. changing the price affects the quantity sold because there are only a few sellersthere are only a few sellers