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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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MARGINAL PROPENSITY TO IMPORT

The change in imports purchased from the foreign induced by a change in income or production (national income or gross domestic product). The marginal propensity to import (abbreviated MPM) is another term for the slope of the imports line and is calculated as the change in imports divided by the change in income or production. The MPM plays a role in Keynesian economics. It augments the slope of the aggregate expenditures line and is part to the multiplier process. A related marginal measure is the marginal propensity to consume.

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Today, you are likely to spend a great deal of time at a dollar discount store looking to buy either several magazines on fashion design or a package of 3 by 5 index cards, the ones without lines. Be on the lookout for jovial bank tellers.
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The 1909 Lincoln penny was the first U.S. coin with the likeness of a U.S. President.
"Most of the things worth doing in the world had been declared impossible before they were done."

-- Louis D. Brandeis, Supreme Court Justice

AR(N)
A nth-order Autoregressive Process
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