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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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INVESTMENT, PRODUCTION POSSIBILITIES

Investment typically refers to the purchase of productive capital by business in anticipation of increasing production and (presumably) generating more profit. More generally, investment can be considered as sacrificing the current satisfaction of wants and needs (consumption goods) to expand productive capability (capital goods). Production possibilities analysis can be used to illustrate the tradeoff between consumption and capital as a movement along a production possibilities curve.

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