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SHORT-RUN SUPPLY CURVE: For a perfectly competitive firm, the marginal cost curve that lies above the average variable cost curve. This segment of the marginal cost guides a perfectly competitive firm's profit maximizing production as it equates price to marginal cost. Because the marginal cost curve is positively sloped (due to the law of diminishing marginal returns), each firm's supply curve and the market supply curve are also positively sloped. The law of diminishing marginal returns thus provides an explanation for the law of supply. However, this only works for firms with NO market control. Monopoly, monopolistic competition, and oligopoly, with market control, do not achieve the same result.

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INJECTIONS

Non-consumption expenditures on aggregate production. The three aggregate expenditures grouped under the heading of injections are investment expenditures, government purchases and exports. Injections add to the core circular flow containing consumption, production, and income. The injections-leakages model is a Keynesian economics analysis that combines injections with leakages (saving, taxes, and imports) to identify the equilibrium level of aggregate production and income.

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Today, you are likely to spend a great deal of time at a flea market hoping to buy either an AC adapter that works with your MPG player or rechargeable batteries. Be on the lookout for vindictive digital clocks with revenge on their minds.
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A communal society, a prime component of Karl Marx's communist philosophy, was advocated by the Greek philosophy Plato.
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