If a firm produces nothing, which of the following costs will be zero?

If an externality is created by a single person or firm, and affects only a single person or firm, then

a. it is referred to as a single externality b. the inefficiency caused by that externality may be resolved by those two parties c. the externality takes the form of a side payment d. Pareto efficiency is guaranteed e. fairness dictates that the externality be removed

Today, in the United States, imports are about

A) 16 percent of GDP. B) 32 percent of GDP. C) 8 percent of GDP. D) 4 percent of GDP.