The Keynesian aggregate supply curve is

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The Keynesian aggregate supply curve is horizontal until it reaches the economy's potential output or Natural Real GDP (QN), and then becomes vertical. This is because in the Keynesian model, there are certain constraints on production, such as shortages of labor, capital, and natural resources, which prevent firms from increasing output beyond a certain level. Consequently, the economy can operate below its potential output without generating inflationary pressures or upward pressure on prices. Only when the economy reaches QN does the aggregate supply curve become vertical, indicating that any increases in aggregate demand will lead to higher prices rather than higher output.

The Keynesian Aggregate Supply Curve Is