The short-run aggregate supply curve is positively sloped because:

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In the short run, firms are often unable to adjust their input prices as quickly as the level of output changes, which means that their costs and willing supply levels remain fairly constant. As a result, an increase in demand for goods and services results in an increase in the price level, which encourages suppliers to increase their output levels. This positive slope of the short-run aggregate supply curve reflects the fact that a higher level of output requires a higher price level to maintain the current level of profitability for businesses.

The Short-Run Aggregate Supply Curve Is Positively Sloped Because