The long-run aggregate supply curve is vertical because of the assumption that all variables are fixed in the long run.

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The long-run aggregate supply curve is vertical because it assumes that all input prices are flexible in the long run, meaning that changes in aggregate demand will not affect the economy's potential output. This is known as the natural rate of output. The assumption is not that all variables are fixed in the long run.

The Long-Run Aggregate Supply Curve Is Vertical Because of the Assumption