Which of the following arguments about the efficiency of monopolistic competition in allocating resources is most accurate？
A. Since economic profits in the long run are positive for firms in monopolistic competition, there are efficiency losses.
B. Product differentiation under monopolistic competition offers benefits that tend to offset inefficiency from the reduction in output compared to perfect competition.
C. Advertising expenditures under monopolistic competition represent a deadweight loss to society.
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寄生虫包括________、________、________、线虫、________、________和蛭类。
水产动物免疫的功能包括___________、__________和___________等。
As a result of a decline in cucumber production by small-scale growers, the U.S. government has decided to provide assistance to cucumber growers by paying them $0.05 per pound produce
A. Which of the following is the most likely result of this policy？
B. The marginal benefit of cucumbers will exceed the marginal cost, causing a deadweight loss.
C. The marginal cost of cucumbers will exceed the marginal benefit, causing a deadweight loss.
D. The marginal cost of cucumbers will exceed the marginal benefit, and a shortage of cucumbers will emerge
常用的杀寄生虫药物有___________、__________和___________等。
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