Assuming constant inflation, a shift of the expenditure line will cause a shift of the AD curve.

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An upward shift of the expenditure line, due to factors such as increased consumer confidence or government spending, will cause a corresponding upward shift of the AD (aggregate demand) curve. This is because the expenditure line and AD curve both represent the relationship between price level and aggregate expenditure in the economy, and any change in one will affect the other. Constant inflation means that prices are rising at a steady rate, which is assumed to be factored into both the expenditure line and AD curve.

Assuming Constant Inflation, a Shift of the Expenditure Line Will