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PERFECT COMPETITION CHARACTERISTICS: The four key characteristics of perfect competition are: (1) large number of small firms, (2) identical products sold by all firms, (3) freedom of entry into and exit out of the industry, and (4) perfect knowledge of prices and technology. These four characteristics mean that a given perfectly competitive firm is unable to exert any control whatsoever over the market.

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SIMPLE TAX MULTIPLIER

A measure of the change in aggregate production caused by changes in a government taxes that shocks the macroeconomy, when consumption is the ONLY induced expenditure. The simple tax multiplier is the negative marginal propensity to consume times the inverse of one minus the marginal propensity to consume. A related multiplier is the simple expenditures multiplier, which measures the change in aggregate production caused by changes in an autonomous expenditure.

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Today, you are likely to spend a great deal of time at a crowded estate auction trying to buy either a coffee cup commemorating Thor Heyerdahl's Pacific crossing aboard the Kon-Tiki or a rechargeable battery for your cell phone. Be on the lookout for malfunctioning pocket calculators.
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The earliest known use of paper currency was about 1270 in China during the rule of Kubla Khan.
"If football taught me anything about business, it is that you win the game one play at a time."

-- Fran Tarkenton, Football Player

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Integrated Generalized Autoregressive Conditional Heteroskedasticity
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