The function that shows the inverse relationship between planned consumption and investment spending and the real interest rate, all else constant, is called the:

Refer to Figure 4-1. Arnold's marginal benefit from consuming the fourth burrito is

A) $0. B) $1.00. C) $2.50. D) $3.00.

When plotted with the aggregate price level on the vertical axis and output on the horizontal axis, which of the following curves slopes downward?

A) SRAS B) AD C) LRAS D) None of the above