The demand curve in macroeconomics is called the Aggregate Demand. The shape of the demand curve is downward sloping as shown in figure below as it shows a negative relationship between the price level and Real GDP.
AD = C + I + G + NX
where C = Consumption spending
I = investment spending
G = government spending
NX = Net Exports
Any change in C, I, G or NX will affect the AD. Increase in consumption expenditure will shift the AD curve to the right and vice-versa.
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