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SEVENTH RULE OF COMPLEXITY: The seventh of seven basic rules of the economy. It is the observation that the world is complex, that every action has direct and often intended consequences and indirect and probably unintended effects (that is, cause and effect). A few of the more noted illustrations of this seventh rule are the circular flow (especially the expenditure multiplier) and market failures (especially externalities).

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MARGINAL REVENUE

The change in total revenue resulting from a change in the quantity of output sold. Marginal revenue indicates how much extra revenue a firm receives for selling an extra unit of output. It is found by dividing the change in total revenue by the change in the quantity of output. Marginal revenue is the slope of the total revenue curve and is one of two revenue concepts derived from total revenue. The other is average revenue. To maximize profit, a firm equates marginal revenue and marginal cost.

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Today, you are likely to spend a great deal of time at the confiscated property police auction hoping to buy either a turbo-powered vacuum cleaner or a battery-powered, rechargeable vacuum cleaner. Be on the lookout for empty parking spaces that appear to be near the entrance to a store.
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This isn't me! What am I?

Lewis Carroll, the author of Alice in Wonderland, was the pseudonym of Charles Dodgson, an accomplished mathematician and economist.
"How we spend our days is, of course, how we spend our lives. "

-- Annie Dillard, essayist

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