The output-Expenditure Model was made famous by?

The output-expenditure model was made famous by economist John Maynard Keynes, particularly through his work in "The General Theory of Employment, Interest, and Money" published in 1936. This model emphasizes the relationship between total output (or income) in an economy and the total expenditure, highlighting the role of aggregate demand in determining economic activity. It laid the foundation for modern macroeconomic theory and policy, particularly in the context of managing economic fluctuations.