The unemployment rate is usually zero except during recessions

Assume the economy is experiencing an inflationary gap, Keynesian economists believe that:

a. flexible wages will restore full employment. b. the Federal Reserve should lower the interest rate. c. the federal government should decrease spending to shift the aggregate demand curve leftward. d. the federal government should increase spending to shift the aggregate demand curve rightward.

A firm hires labor, capital, and land to produce grapefruits. Currently the marginal product of the last unit of labor input is 40, the marginal product of the last unit of capital input is 60, and the marginal product of the last unit of land input is 200. The market wage is $20 and the market price for capital is $30. If the firm is using the optimal combination of inputs, then the price of land is

A. $4. B. $40. C. $100. D. indeterminate from the given information.