中等ECON-DEMA-018
Tea and milk are complements for milk tea. The price of tea rises. What happens in the milk market, ceteris paribus?
A. Supply of milk shifts left.
B. Demand for milk shifts left.✓ 答案
C. Demand for milk shifts right.
D. The milk supply curve moves along itself because tea is an input.
解說
Complements are used together. When tea becomes more expensive, people buy fewer drinks that need both, so demand for milk falls. That is a demand shift in the milk market, not a supply shift. Tea is not modelled here as an input into milk production.