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Potential GDP in the Aggregate Demand Aggregate Supply Model

How does Potential GDP affect the Aggregate Demand Aggregate Supply Model?

Written by Jason Gordon

Updated at March 28th, 2023

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How does Potential GDP affect the Aggregate Demand Aggregate Supply Model?

In the aggregate demand/aggregate supply model, we show potential GDP as a vertical line. Neoclassical economists who focus on potential GDP as the primary determinant of real GDP argue that the long-run aggregate supply curve is located at potential GDP—that is, we draw the long-run aggregate supply curve as a vertical line at the level of potential GDP. A vertical LRAS curve means that the level of aggregate supply (or potential GDP) will determine the economy's real GDP, regardless of the level of aggregate demand. Over time, increases in the quantity and quality of physical capital, increases in human capital, and technological advancements shift potential GDP and the vertical LRAS curve gradually to the right. Economists often describe this gradual increase in an economy's potential GDP as a nation's long-term economic growth.

In the neoclassical model, we draw the aggregate supply curve as a vertical line at the level of potential GDP. If AS is vertical, then it determines the level of real output, no matter where we draw the aggregate demand curve. Over time, the LRAS curve shifts to the right as productivity increases and potential GDP expands.

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