In the simple Keynesian model,the aggregate supply curve has a horizontal segment and a vertical segment at full-employment.

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In the simple Keynesian model, the aggregate supply curve is represented by a horizontal line up to the full-employment level of output, indicating that an increase in aggregate demand would lead to an increase in output but no change in price level. Once the economy reaches full employment, the aggregate supply curve becomes vertical, indicating that any increase in aggregate demand beyond the full-employment level would only lead to a rise in the price level without any additional increase in output.

In the Simple Keynesian Model,the Aggregate Supply Curve Has a Horizontal