The Demand Curve Is Constructed with a

The demand curve is constructed with a

A) positive slope, because as more is purchased of a good, the cost of producing it rises.
B) positive slope, because as buyers have more money, the more of a particular good will be purchased.
C) negative slope, because when people purchase more of a good, the cost to produce that good falls.
D) negative slope, because with everything else equal, buyers will purchase more of a good when its price is lower.
E) positive slope, because as the price rises, people want to sell more of the good.