If GDP is currently $13 trillion and is growing at a rate of 2.3% per year, how long will it take GDP to reach $26 trillion?

The annual rental rate for a machine is

a. the yearly depreciation and maintenance costs for the machine. b. the yearly interest costs associated with owning the machine. c. the initial purchase price of the machine divided by the number of years the machine is expected to last. d. the sum of the yearly depreciation, maintenance, and interest costs associated with owning the machine.

Aggregate demand refers to the relationship between

A. prices and the quantity of a good supplied. B. prices and the quantity of a good demanded. C. the price level and aggregate output supplied. D. the price level and aggregate output demanded.