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THREE-SECTOR INJECTIONS-LEAKAGES MODEL: A model used to identify equilibrium in Keynesian economics based on injections (investment and government purchases) and leakages (saving and taxes) for the three domestic sectors (household, business, and government). Equilibrium is achieved at the intersection of the saving and tax line, S + T, and the investment and government purchases line, I + G.

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RETURNS TO SCALE

Changes in production the occur when all resources are proportionately changed in the long run. Returns to scale come in three forms--increasing, decreasing, or constant based on whether the changes in production are proportionally more than, less than, or equal to the proportional changes in inputs. Returns to scale are the guiding principle for long-run production, playing a similar role that the law of diminishing marginal returns plays for short-run production.

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Today, you are likely to spend a great deal of time at a going out of business sale looking to buy either a replacement remote control for your television or a replacement nozzle for your shower. Be on the lookout for jovial bank tellers.
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A half gallon milk jug holds about $50 in pennies.
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