The Great Depression consisted of how many business cycles?

Which of the following has a currency board?

A) Hong Kong B) The United States C) Mexico D) China

If all unwelcome or harmful activities were eliminated,

a. the benefits from eliminating these activities would exceed the cost of eliminating them b. there would be no remaining potential Pareto improvements c. society would be more efficient d. society would be less efficient e. the result would be Pareto efficient