March 21, 2018 

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LRTC: The abbreviation for long-run total cost, which is the opportunity cost incurred by all of the factors of production used in the long run (when all inputs are variable) by a firm to produce of a good or service, including wages paid to labor, rent paid for the land, interest paid to capital owners, and a normal profit paid to entrepreneurs. Unlike short-run total cost, long-run total cost can not be separated into fixed cost and variable cost. In the long run, all inputs are variable, so all cost is variable.

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TWO-SECTOR KEYNESIAN MODEL: A model used to identify equilibrium in Keynesian economics based on aggregate expenditures by the two basic sectors (household and business). Equilibrium is achieved at the intersection of the aggregate expenditures line, AE = C + I, and the 45-degree line, Y = AE. This is the most basic Keynesian aggregate expenditures model that captures an induce expenditure (consumption) and an autonomous expenditure (investment).

     See also | Keynesian economics | Keynesian equilibrium | consumption line | aggregate expenditures line | 45-degree line | household sector | business sector | three-sector Keynesian model | four-sector Keynesian model |

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The long-run average cost curve is the envelope of an infinite number of short-run average total cost curves, with each short-run average total cost curve tangent to, or just touching, the long-run average cost curve at a single point corresponding to a single output quantity. The key to the derivation of the long-run average cost curve is that each short-run average total cost curve is constructed based on a given amount of the fixed input, usually capital. As such, when the quantity of the fixed input changes, the short-run average total cost curve shifts to a new location.

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