单项选择题

The marginal benefit from consuming the fourth unit of a product is $34, and the marginal cost to the producer of the fourth unit is $25. Under these circumstances, which of the following statements is most accurate

A. Producer surplus is maximized.
B. The efficient quantity is less than four.
C. Producing and selling the fourth unit will increase efficiency.

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单项选择题In an competitive market, which of the following conditions most accurately describes the condition that exists when the efficient quantity of a good or service is produced and consumed

A. Producer surplus is maximized.
B. Consumer surplus equals producer surplus.
C. The sum of consumer surplus and producer surplus is maximized.

单项选择题As the demand (marginal benefit) curve becomes less elastic, if the equilibrium price and quantity remain unchanged, consumer surplus:

A. decreases.
B. increases.
C. remains unchanged.