Answer the question based on the following list of items that are related to aggregate demand and/or aggregate supply. 
Refer to the list above. A change in which factor is most likely to change both aggregate demand and aggregate supply?
Definitions:
Investment
The distribution of assets, typically financial, with the aim of earning revenue or gains.
Private Saving
The portion of households' disposable incomes that is not spent on consumption but saved for future use.
Closed Economy
An economic system that does not interact with other economies in terms of trade, investment, or capital flow.
Households
Economic units consisting of all individuals who occupy a home, which participate in economic decisions.
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