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July 22, 2026 

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SLOPE: A measure of the flatness or steepness of line. It can be thought of as the 'rise' over the 'run', that is the change in the variable on the vertical axis (rise) divided by the change in the variable on the horizontal axis (run).

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UNDERGROUND ECONOMY: Illegal and unreported market transactions and productive activity that escape the watchful eyes of official record keepers. By most estimates, a substantial amount of productive activity takes place in the underground economy for the United States. Of course, these are only estimates because such activity, by definition, goes unreported. Were activity in the underground economy added to official activity in the "overground" economy, then gross domestic product could be boosted by as much as 25% to 50%, or more.

     See also | gross domestic product |


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UNDERGROUND ECONOMY, AmosWEB GLOSS*arama, http://www.AmosWEB.com, AmosWEB LLC, 2000-2026. [Accessed: July 22, 2026].


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OLIGOPOLY AND MONOPOLY

Oligopoly and monopoly have some similarities, both tend to be relatively large and possess significant market control, but also have a few important differences, oligopoly market has more than one firm. The dividing line between oligopoly and monopoly, however, can be blurred due to the closeness of substitutes and the inclination of oligopoly firms to collude.

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Today, you are likely to spend a great deal of time calling an endless list of 800 numbers trying to buy either a set of luggage without wheels or a how-to book on wine tasting. Be on the lookout for cardboard boxes.
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Mark Twain said "I wonder how much it would take to buy soap buble if there was only one in the world."
"You can't build a reputation on what you are going to do."

-- Henry Ford, automaker

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Association of International Bond Dealers (now called International Securities Market Association)
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