If firms in a perfectly competitive industry are making zero economic profit, then
A) some of those firms will leave the industry, because firms cannot persistently go without making economic profit.
B) new firms will enter the industry, because the new entrants would be ensured of doing as well as in their best foregone alternative.
C) there is no incentive for either entry or exit.
D) some of the firms will temporarily shut down.
C
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A plant uses machinery and waste water to produce steel. The owner of the plant wants to maintain an output of 10,000 tons a day, even though the government has just imposed a $100 per gallon tax on using waste water
The reduction in the amount of waste water that results from the imposition of this tax depends on A) the amount of waste water used before the tax was imposed. B) the cost to the firm of using waste water before the tax was put in place. C) the rental rate of machinery. D) the marginal product of waste water only. E) the ratio of the marginal product of waste water to the marginal product of machinery.
Wheat farmers in Kansas would benefit from a devastating crop failure in North Dakota (another major wheat-producing state) if the U.S. demand for wheat is
a. inelastic b. elastic c. unit elastic d. downward sloping e. perfectly elastic