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A: The common notation for the "intercept" term of an equation specified as Y = a + bX. Mathematically, the a-intercept term indicates the value of the Y variable when the value of the X variable is equal to zero. Theoretically, the a-intercept is frequently used to indicate exogenous or independent influences on the Y variable, that is, influences that are independent of the X variable. For example, if Y represents consumption and X represents national income, a measures autonomous consumption expenditures.

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MARGINAL REVENUE CURVE, MONOPOLISTIC COMPETITION

A curve that graphically represents the relation between the marginal revenue received by a monopolistically competitive firm for selling its output and the quantity of output sold. Because a monopolistically competitive firm is a price maker and faces a negatively-sloped demand curve, its marginal revenue curve is also negatively sloped and lies below its average revenue (and demand) curve. A monopolistically competitive firm maximizes profit by producing the quantity of output found at the intersection of the marginal revenue curve and marginal cost curve.

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Today, you are likely to spend a great deal of time wandering around the shopping mall seeking to buy either a travel case for you toothbrush or a looseleaf notebook binder. Be on the lookout for slightly overweight pizza delivery guys.
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A thousand years before metal coins were developed, clay tablet "checks" were used as money by the Babylonians.
"Security can only be achieved through constant change, through discarding old ideas that have outlived their usefulness and adapting others to current facts. "

-- William O. Douglas, Supreme Court Justice

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