According to real business cycle theory, what is considered the primary cause of economic fluctuations?

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Variations in aggregate supplyFluctuations in export demand influenced by global economic conditionsChanges in business confidence levelsAlterations in business expectations about the futureNo specific cause

Explanation

Real business cycle theory attributes economic ups and downs mainly to changes in aggregate supply. Other factors like export demand shifts, business confidence, or expectations are not seen as the fundamental drivers within this framework.