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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单项选择题

______，policymakers may decide it is better to live with the inefficiency of monopolistic pricing.

A．Without raising taxes to pay for these subsidies
B．In order to raise taxes to pay for these subsidies
C．To keep these firms in business
D．Requiring them to lower their prices

单项选择题

Who will be prevented from buying the good

A．Some consumers who also estimate the value of the good at more than the marginal cost of production.
B．Some consumers who estimate the price of the good at more than the marginal cost of the production.
C．Some consumers who have a high opinion of the good at more than the marginal cost of the production.
D．Some consumers who estimate the worth of the good at more than the marginal cost of the production.