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PERFECT COMPETITION: An ideal market structure characterized by a large number of small firms, identical products sold by all firms, freedom of entry into and exit out of the industry, and perfect knowledge of prices and technology. This is one of four basic market structures. The other three are monopoly, oligopoly, and monopolistic competition. Perfect competition is an idealized market structure that's not observed in the real world. While unrealistic, it does provide an excellent benchmark that can be used to analyze real world market structures. In particular, perfect competition efficiently allocates resources.

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GROSS PRIVATE DOMESTIC INVESTMENT

This is the official item in the National Income and Product Accounts maintained by the Bureau of Economics Analysis measuring capital investment expenditures. Gross private domestic investment is expenditures on capital goods to be used for productive activities in the domestic economy that are undertaken by the business sector during a given time period. These expenditures tend to be the least stable of the four expenditures, averaging between 12-18 percent of gross domestic product. This percentage tends to be at the low end during business-cycle contractions and at the high end during business-cycle expansions. The other official expenditures included in the National Income and Product Accounts are personal consumption expenditures, government consumption expenditures and gross investment, and net exports of goods and services.

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Today, you are likely to spend a great deal of time at an auction seeking to buy either a large green chalkboard shaped like the state of Maine or a replacement battery for your pocket calculator. Be on the lookout for celebrities who speak directly to you through your television.
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The first "Black Friday" on record, a friday marked by a major financial catastrophe, occurred on September 24, 1869 -- A FRIDAY -- when an attempted cornering of the gold market induced a financial crises and economy-wide depression.
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