The best explanation for the relatively horizontal area of the short run aggregate supply curve is that, "with an economy operating below potential output, an increase in aggregate demand causes real output to increase."
The short-run aggregate supply curve is horizontal. This happens because in the short-run production can be increased without any real effect on the average costs of production.
The horizontal short-run aggregate supply curve shows that even if the output increases, the price remains the same. So here the aggregate demand curve can shift to the right and can meet the aggregate supply curve at a new point.
Hence, here the price level will remain unchanged.
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