Which of the following is true when an economy produces at full employment, but consumers, government, businesses, and the foreign sector do not buy all the output? a.) Inventories are depleted. b.) There is a recessionary gap. c.) Unemployment falls. d.) The price level rises.

When an economy produces at full employment, but consumers, government, there is a recessionary gap - Option B.

Explanation:

According to the Keynesian perspective, firms produce output only if they expect it to sell.

While the availability of the factors of production determines a nation's potential gross domestic product (GDP), the amount of goods and services actually being sold, known as real GDP depends on how much demand exists across the economy.

Keynes termed a fall in the aggregate demand as a recessionary gap.

A recessionary gap refers to an economy operating at a level below its full-employment equilibrium. Under this condition, the level of real gross domestic product (GDP) is lower than the level of full employment, which puts downward pressure on prices in the long run.

Thus, when an economy produces at full employment, but consumers, government, there is a recessionary gap - Option B.