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OLIGOPOLY, CONCENTRATION: Oligopoly is a market structure that contains a small number of relatively large firms, meaning oligopoly markets tend to be concentrated. A small number of large firms account for a majority of total output. Concentration unto itself is not necessarily bad, but it often leads to inefficient behavior, such as collusion and nonprice competition. Concentration is measured in three ways--market share, concentration ratio, Herfindahl index.

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BALANCE OF PAYMENTS

A comprehensive set of accounts that tracks the flow of currency and other monetary assets coming in to and going out of a nation. These payments are used for international trade, foreign investments, and other financial activities. The balance of payments is divided into two accounts -- current account (which includes payments for imports, exports, services, and transfers) and capital account (which includes payments for physical and financial assets). A deficit in one account is matched by a surplus in the other account. The balance of trade is only one part of the overall balance of payments set of accounts.

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Today, you are likely to spend a great deal of time at a going out of business sale trying to buy either a key chain with a built-in flashlight and panic button or a green and yellow striped sweater vest. Be on the lookout for slightly overweight pizza delivery guys.
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The 22.6% decline in stock prices on October 19, 1987 was larger than the infamous 12.8% decline on October 29, 1929.
"It is very rare that you meet with obstacles in this world (that) the humblest man has not the faculties to surmount. "

-- Henry David Thoreau, philosopher

ARIMA
Autoregressive Integrated Moving Average
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