高階econ-u01-d06
A student writes: 'Any rise in price means demand increased.' What is the error in this reasoning?
A. A higher price can come from a supply fall, which moves quantity demanded down the same curve✓ 答案
B. Prices never rise when demand is unchanged
C. Demand can only change because of tastes
D. A price rise always shifts the supply curve left
解說
Price is where demand and supply meet. A price rise caused by a leftward supply shift is a movement along an unchanged demand curve, so demand did not increase. Only non-price factors shift demand.