There are two types of supply shocks. Adverse supply shocks include things like increases in oil prices, a drought that destroys crops, and aggressive union actions. In general, adverse supply shocks cause the price level for a given amount of output to increase. This is represented by a shift of the short-run aggregate supply curve to the left. Positive supply shocks include things like decreases in oil prices or an unexpected great crop season. In general, positive supply shocks cause the price level for a given amount of output to decrease. This is represented by a shift of the short-run aggregate supply curve to the right. Let's work through an example. For this example, refer to . Notice that we begin at point A where short-run aggregate supply curve 1 meets the long-run aggregate supply curve and aggregate demand curve 1. Thus, we are in long-run equilibrium to begin.
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