In 2011, what percentage of federal government receipts came from corporate income taxes?

Monopolies that price discriminate do so because

A) they are able to do so and no one else can. B) they can increase their profits. C) it keeps them out of trouble with the government. D) it is more efficient.

When building a model, an economist must:

a. adjust for exceptional situations. b. provide a complete description of reality. c. make simplifying assumptions. d. develop a set of behavioral equations.