单项选择题

What does a new firm think about when it considers entering the market with a new product

A．Two external effects.
B．The externalities associated with entry.
C．The number of firms in the market.
D．The profit it would mak
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单项选择题
A．roomB．freedomC．problemD．bargain
A．room
B．freedom
C．problem
D．bargain
单项选择题
Why would policy makers need to regulate all firms that produce differentiated products
A．Because such products are so common in the economy.
B．Because there is no easy way for policymakers to fix the problem.
C．Because they want to enforce marginal-cost pricing.
D．Because monopolistic competitors are making zero profits.
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