9.6
An aggregate supply shock is an unexpected event causing sudden changes in supply, affecting prices and economic output. An aggregate supply shock is either adverse or favorable.
Adverse supply shocks often result from droughts, hurricanes, or wars that damage supply chains and raise production costs.
The AD–AS model shows that such a shock shifts the aggregate supply curve leftward, from AS₁ to AS₂. The economy moves from its original equilibrium point E to a new point F.
At point F, output decreases from Y₁ to Y₂, while the price level rises from P₁ to P₂. This combination of falling output and rising prices creates stagflation, where inflation and unemployment rise together.
Favorable supply shocks, such as technological progress or lower input costs, shift the aggregate supply curve rightward from AS₁ to AS₃. The new equilibrium shows higher output and lower prices, reflecting economic growth and stability in the goods market.
Ultimately, these sudden shifts in the supply curve identify whether the economy faces the hardship of stagflation or the prosperity of growth.
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