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DERIVED DEMAND: The notion that the demand for a factor or production, an input used in the production of a good, depends on the demand for the output being produced. This concept highlights the two key aspects of factor demand. One is that factor demand depends on the value of the good being produced. Inputs that produce more valuable outputs are themselves more highly valued. Two is that factor demand depends on the productivity of the input. Inputs that produce more output are themselves more highly valued.

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


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THREE-SECTOR KEYNESIAN MODEL, AmosWEB GLOSS*arama, http://www.AmosWEB.com, AmosWEB LLC, 2000-2026. [Accessed: October 5, 2026].


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LONG-RUN AVERAGE COST

The per unit cost of producing a good or service in the long run when all inputs under the control of the firm are variable. In other words, long-run total cost divided by the quantity of output produced. Long-run average cost is guided by returns to scale.

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