aggregate demand

Aggregate demand is a measurement of the total amount of demand for all finished goods and services produced in an economy. Aggregate demand is expressed as the total amount of money exchanged for those goods and services at a specific price level and point in time.

In other words,

GDP = Output = AD = C + I + G + NX

In an AS-AD model, the aggregate demand curve is downward sloping. This can be explained by wealth effect, interest rate effect, and net export effect.