In the aggregate expenditures model, it is assumed that

does not change when real GDP changes.

Explanation:John Maynard Keynes created the aggregate expenditures model based primarily on great depression of the 1930s.The aggregate expenditure model relates the components of spending (consumption, investment, government purchases, and net exports) to the level of economic activity. ... If households have higher income, they will increase their spending. In this case it talks about investment which is assumed not to change when real GDP changes.

answer; ///i believe the correct answer is (c) laissez-faire;

i guess you could put raise the economic balance