In a simple macroeconomic model, only one component of expenditures is allowed to change:

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Quizplus · Accepted Answer

In a simple macroeconomic model, only consumption is typically allowed to change. This is due to the assumption that investment, government spending, and net exports are generally fixed in the short run. Transfer payments are not a component of expenditures, but rather a flow of income from the government to individuals or other entities.

In a Simple Macroeconomic Model, Only One Component of Expenditures