单项选择题

The cash price consumers pay for a product is most likely to increase as the result of a:（）

A. government subsidy to product producers.
B. quota on how much of the product can be produced.
C. new law imposing high penalties for sales of the product.

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单项选择题Assume that the supply of ethanol is relatively more elastic than the demand for ethanol. Compared to an initial competitive equilibrium in the market for ethanol, the imposition of a per-gallon tax on producers of ethanol will most likely:（）

A. decrease producer surplus by the total amount of tax collected.
B. decrease producer surplus by less than it reduces consumer surplus.
C. decrease the sum of consumer and producer surplus by the amount of tax collected.

单项选择题Which of the following best describes the relationship between the Herfindahl-Hirschman Index and the indicated type of market Market type Herfindahl-Hirschman Index （） ①A. Perfect competition 1800 ②B. Monopolistic competition 100 ③C. Monopoly 10000

A. ①
B. ②
C. ③