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

Economists assume that households try to maximize utility and firms try to:

a. maximize profits. b. maximize scale of operation. c. maximize sales. d. maximize capital usage.

If the economy is operating on the relatively vertical segment of the aggregate supply curve, an increase in aggregate demand causes a ________ change in the price level and a ________ change in output.

A. big; big B. big; small C. small; big D. small; small