But what does the equation for the aggregate supply curve mean

But what does the equation for the aggregate supply curve mean

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But what does the equation for the aggregate supply curve mean? Basically, this  equation means that output deviates from the natural rate of output when the price level  deviates from the expected price level. The constant, a, shows how much output  changes due to unexpected deviation in the price level. It is also important to notice that  the slope of the aggregate supply curve is (1/a).  depicts the short-run aggregate supply curve and the long- run aggregate supply curve.  Notice that the axes are the same as for the aggregate demand curve. The vertical axis  is the price level. The horizontal axis is output or income. Also notice that the short-run  aggregate supply curve is downward sloping with slope equal to (1/a) while the long-run  aggregate supply curve is vertical with no slope.  Aggregate Supply in the Short Run  The equation for aggregate supply presented above holds only in the short run. Recall 
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But what does the equation for the aggregate supply curve mean

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