One reason for the _ slope of the demand curve is that as prices fall _.

A.downward; more people find that the price is less than their reservation price.

B.upward; people expect goods to be of lower quality.

C.upward; more people purchase the good.

D.downward; fewer people find that the price equals their reservation price.

正确答案：downward; more people find that the price is less than their reservation price.