FOUR-SECTOR KEYNESIAN MODEL: A model used to identify equilibrium in Keynesian economics based on aggregate expenditures by all four sectors (household, business, government, and foreign). Equilibrium is achieved at the intersection of the aggregate expenditures line, AE = C + I + G + (X - M), and the 45-degree line, Y = AE. This is the complete Keynesian aggregate expenditures model can be used to analyzed the impact of the foreign sector on aggregate expenditures and equilibrium. See also | Keynesian economics | Keynesian equilibrium | consumption line | aggregate expenditures line | 45-degree line | household sector | business sector | government sector | foreign sector | fiscal policy | two-sector Keynesian model | three-sector Keynesian model |
