Answer:
The correct answer is I and III.
Explanation:
The aggregate demand curve of an economy shows the overall demand in the economy as a whole. It is composed of consumption expenditure, government expenditure, investment expenditure, and net exports.
In other words, it shows the demand by households, firms, government, and foreign consumers.
The aggregate demand curve also helps in determining the price level. When there is a consistent increase in the general price level over a long period, it is called inflation.
