If Wrex can produce more math problems per hour and more book reports per hour than Maxine can, then Wrex cannot gain from trading math problems and book reports with Maxine

From a firm's point of view, when the demand for a good has a price elasticity of 0.5, then, all things remaining the same, a(n):

A) increase in the price of the good will decrease the firm's revenue. B) increase in the price of the good will increase the firm's revenue. C) change in the price of the good will not affect the firm's revenue. D) change in the price of the good will not affect the quantity of the good demanded by consumers.

The figure above shows the market for college education in the United States. The marginal external benefit associated with educating 14 million students is ________ per student per year

A) $16,000 B) $13,000 C) $11,000 D) $5,000 E) $7,000