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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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MARGINAL COST AND LAW OF DIMINISHING MARGINAL RETURNS

Decreasing then increasing marginal cost, reflected by a U-shaped marginal cost curve, is the result of increasing then decreasing marginal returns. In particular the decreasing marginal returns is caused by the law of diminishing marginal returns. As such, the law of diminishing marginal returns affects not only the short-run production of a firm but also the cost of short-run production. This translates into a positively-sloped supply curve for profit-maximizing competitive firms.

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Today, you are likely to spend a great deal of time at a garage sale hoping to buy either car battery jumper cables or a dozen high trajectory optic orange golf balls. Be on the lookout for the happiest person in the room.
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Potato chips were invented in 1853 by a irritated chef repeatedly seeking to appease the hard to please Cornelius Vanderbilt who demanded french fried potatoes that were thinner and crisper than normal.
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