请问这题目的考点在讲义的什么地方？
Xia Tian is the chief economist at an investment management firm. He is entrusted with the job of making economic forecasts on countries across the world.
Tian believes that if Country C were to adopt a more open trade policy, it would result in increased competition from foreign companies and force less efficient domestic companies to exit and the more efficient ones to innovate, raising the efficiency of the overall national economy.
Regarding Country C’s potential benefit from a more open trade policy, Tian is most likely referring to a:
A scale effect.
B selection effect.
C backwardness effect.
B is correct.
