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LAW OF INCREASING OPPORTUNITY COST: The proposition that opportunity cost, the value of foregone production, increases as more of a good is produced. This "law" can be seen in the production possibilities schedule and is illustrated graphically through the slope of the production possibilities curve. It generates the distinctive convex shape of the curve, making it flat at the top and steep at the bottom.

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MARGINAL REVENUE, MONOPOLISTIC COMPETITION

The change in total revenue resulting from a change in the quantity of output sold. Marginal revenue indicates how much extra revenue a monopolistically competitive 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 monopolistically competitive firm equates marginal revenue and marginal cost.

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Today, you are likely to spend a great deal of time searching for rummage sales seeking to buy either a package of 4 by 6 index cards, the ones with lines or a 50 foot extension cord. Be on the lookout for deranged pelicans.
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A thousand years before metal coins were developed, clay tablet "checks" were used as money by the Babylonians.
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