When there is an increase in the expected price level, it will shift a. the short-run aggregate supply curve to the left but does not affect the long-run aggregate supply curve.
The increase in expected price level will lead to the short run aggregate supply curve shifting to the left.
This is because suppliers will reduce supply so that they can make more profit when the prices rise in the immediate future. The long run aggregate supply curve will not be affected because supply would normalize eventually.
In conclusion, option A is correct.
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