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PERFECT COMPETITION AND SHORT-RUN SUPPLY CURVE: A perfectly competitive firm's supply curve is that portion of its' marginal cost curve that lies above the minimum of the average variable cost curve. A perfectly competitive firm maximizes profit by producing the quantity of output that equates price and marginal cost. As such, the firm moves along it's marginal cost curve in response to alternative prices. Because the marginal cost curve is positively sloped due to the law of diminishing marginal returns, the firm's supply curve is also positively sloped.

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GOVERNMENT CONSUMPTION EXPENDITURES AND GROSS INVESTMENT

The official item in the National Income and Product Accounts maintained by the Bureau of Economics Analysis measuring government purchases undertaken by the government sector. Government consumption expenditures and gross investment averages between 15-20 percent of gross domestic product. As might be expected, this percentage tends to be ebb and flow with the political winds. Some political leaders prefer more government activity, others less. However, this percentage is even more dependent on military conflicts and wars that require massive government activity. The other official expenditures included in the National Income and Product Accounts are personal consumption expenditures, gross private domestic investment, and net exports of goods and services.

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Today, you are likely to spend a great deal of time strolling around a discount warehouse buying club trying to buy either pink cotton balls or a genuine down-filled comforter. Be on the lookout for small children selling products door-to-door.
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Parker Brothers, the folks who produce the Monopoly board game, prints more Monopoly money each year than real currency printed by the U.S. government.
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