中等ECON-DEMA-013
Flour becomes more expensive. The price of egg tarts has not yet changed. What happens to the supply of egg tarts?
A. The supply curve shifts left✓ 答案
B. There is a movement along an unchanged supply curve
C. Demand shifts right
D. Egg tarts become a free good
解說
Flour is an input. A higher input price raises cost at every output price, so supply shifts left. The own-price of egg tarts did not change, so this is not a movement along the curve.