The U.S. Treasury estimates that the fraction of U.S. currency held outside the United States is:

Sports announcers often refer to a batter in a hitting slump as "being due." If they are correct, then it must be the case that

A) a batter's hits are randomly distributed. B) a batter's at-bats are related to each other. C) a batter's at-bats are independent of each other. D) baseball players are acting irrationally.

Variable costs are

a. the same as sunk costs b. irrelevant to decision making, because they are sunk c. the costs of inputs that vary with the level of production d. the costs of inputs that do not vary with the level of production e. the additional total cost associated with producing an additional unit of output