Aggregate demand is the total demand for final goods and services in an economy at a given time. It specifies the amounts of goods and services that will be purchased at all possible price levels. It is measured as:
A.D. = C + I + G + (X-M)
where,
A.D. is Aggregate Demand
C is consumption expenditure
I is Investment expenditure
G is Government expenditure and
(X-M) are Net exports (expenditure on Exports)