题目：Causes of market failure include（）
A．externalities and market power
B．market power and incorrect forecasts of consumer demand
C．xternalities and foreign competition
D．incorrect forecasts of consumer demand and foreign competition
题目：Causes of market failure include（）
A．externalities and market power
B．market power and incorrect forecasts of consumer demand
C．xternalities and foreign competition
D．incorrect forecasts of consumer demand and foreign competition