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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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INVESTMENT EXPENDITURES DETERMINANTS

Ceteris paribus factors, other than aggregate income or production, that are held constant when the investment line is constructed and which cause the investment line to shift when they change. Some of the more important investment expenditures determinants are interest rates, expectations, wealth, capital prices, and technology.

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Today, you are likely to spend a great deal of time waiting for visits from door-to-door solicitors wanting to buy either a coffee cup commemorating yesterday or a replacement remote control for your television. Be on the lookout for malfunctioning pocket calculators.
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The first U.S. fire insurance company was established by Benjamin Franklin in 1752 in Philadelphia.
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