From the diagram above, the AE standard for Aggregate expenditures, and Y is the GDP/Income of a nation. Because people's spending is depends on how much money they earned (income), thus the income is equal to the output in Keynesian theory.
I also learned several equations which related to Keynesian theory. For an example, AE (Aggregate expenditures) = C (autonomous spending) + I (invest) + G (government purchases) + X(import) - M (export). Because export is going our from the nation to another country, therefore, the equation should subtract export.
Personally, I think I am not fully understand what the Keynesian theory is really about, unless I only know some basic ideas and formulas of it. I hope that as I learn more and read more materials about the Keynesian Economy, I will know more about it and hope one day I can analyze this theory on my own perspective.
Work Cited:
Martin, Lawrence. "Keynesian Economics-Short Run with Sticky Prices". EC202 Lecture Notes. Oct.2013. Web. Oct.17. 2013
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