When both the demand for a good increases and the supply of the good increases, the equilibrium quantity definitely increases

Which of the following best describes the policy ineffectiveness proposition?

A) Monetary policy cannot change real GDP in a regular or predictable way. B) Policymakers can be effective in changing real GDP only if people's expectations are correct. C) Monetary policy can change real GDP only if the Fed pursues a consistent, stable growth rate of the real money supply. D) Fiscal policy is totally ineffective in changing real GDP in both the short run and the long run.

When economists say an activity is consistent with economic efficiency, they mean

a. a majority of citizens favor the activity. b. the benefits that result from the activity exceed the costs. c. the number of people who gain from the activity exceeds the number on whom costs are imposed. d. the costs that result from the activity exceed the benefits.