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DIRECT: The mathematical notion that two variables change in the same direction, that is, an increase in X goes with an increase in Y, or a decrease in X goes with a decrease in Y. The alternative to a direct relation is an inverse relation, in which an increase in one variable goes with a decrease in the other. Direct relations are graphically illustrated by positively-sloped curves, a common example being the supply curve.

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AVERAGE VARIABLE COST

Total variable cost per unit of output, found by dividing total variable cost by the quantity of output. When compared with price (per unit revenue), average variable cost (AVC) indicates whether or not a profit-maximizing firm should shut down production in the short run. Average variable cost is one of three average cost concepts important to short-run production analysis. The other two are average total cost and average fixed cost. A related concept is marginal cost.

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PURPLE SMARPHIN
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Today, you are likely to spend a great deal of time watching infomercials wanting to buy either a birthday gift for your mother or a weathervane with a horse on top. Be on the lookout for small children selling products door-to-door.
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In the late 1800s and early 1900s, almost 2 million children were employed as factory workers.
"Life is no brief candle to me. It is a sort of splendid torch which I have got a hold of for the moment, and I want to make it burn as brightly as possible before handing it on to future generations."

-- George Bernard Shaw

AR(N)
A nth-order Autoregressive Process
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