中等econ-u01-d03
Rain is forecast for Sunday, so many people buy umbrellas before the price of umbrellas changes. On a demand-and-supply diagram this is:
A. A rightward shift of the demand curve✓ 答案
B. A leftward shift of the supply curve
C. A movement down the existing demand curve
D. A leftward movement along the demand curve
解說
Expectations about future weather are a non-price determinant of demand, so the whole curve shifts right. A movement along the curve needs a change in the good's own price.