中等ECON-DEMA-017
A typhoon warning closes the port for a week. Imported fruit sellers cannot restock. Holding demand constant, the immediate effect is:
A. A leftward shift of supply and a higher equilibrium price.✓ 答案
B. A rightward shift of demand because fruit is scarcer.
C. A movement down the supply curve only.
D. A lower equilibrium price because fewer ships arrive.
解說
Fewer deliveries are a supply-side shock: at each price, less fruit is offered, so supply shifts left. With demand unchanged, equilibrium price rises and quantity falls. Scarcity is the result of the supply shift, not a reason to shift demand.