高階econ-u01-d05
Demand for local strawberries rises and the number of sellers also grows. Both curves shift right by similar amounts. Equilibrium quantity will:
A. Rise, while the effect on equilibrium price depends on which shift is larger✓ 答案
B. Fall, because two rightward shifts must always lower price
C. Stay unchanged, because the shifts cancel out
D. Rise by exactly the same amount as each shift
解說
Two rightward shifts always raise equilibrium quantity. The price outcome is ambiguous: a larger demand shift raises price, a larger supply shift lowers it, and equal shifts can leave price broadly unchanged.