In the long run,changes in aggregate demand will affect the level of Real GDP (but not the price level)in a self-regulating economy.

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In a self-regulating economy, changes in aggregate demand can affect both the level of Real GDP and the price level. For example, if aggregate demand increases, it can lead to an increase in both Real GDP and the price level, while a decrease in aggregate demand can lead to both a decrease in Real GDP and the price level.

In the Long Run,changes in Aggregate Demand Will Affect the Level