Which type of market structure contains a single buyer?

Spending more time commuting in exchange for a lower monthly rent refers to a(n):

A) barter. B) trade-off. C) externality. D) monetary exchange.

The law of diminishing marginal returns says that as the firm uses more of ________, with a given quantity of ________, the ________ product of the variable input eventually diminishes

A) a fixed input; variable inputs; marginal B) all inputs; capital; average C) a variable input; fixed inputs; average D) a variable input; fixed inputs; marginal