中等ECON-MSTR-006
In monopolistic competition, Hong Kong coffee shops differentiate their products. In long-run equilibrium, each shop earns:
A. Positive economic profit
B. Zero economic profit✓ 答案
C. Negative economic profit
D. Maximum possible profit
解說
Free entry drives economic profit to zero in the long run, though firms maintain excess capacity and price exceeds marginal cost.