Refer to the accompanying graph. If this firm is a price taker and the price of each unit of output is $9, then at its profit-maximizing level of output, this firm will earn a ________ of ________.

What matters to people is the real value of money or income

Indicate whether the statement is true or false

Which of the following statements is (are) incorrect?

a. Consumption plays a central role in the Keynesian theory of income determination b. Consumer expenditure is the largest component of aggregate demand c. In recent years, consumption has totaled between 60 and 70 percent of GDP d. Keynes believed that investment was largely determined by expectations e. all of the above are correct