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MARGINAL REVENUE, PERFECT COMPETITION: The change in total revenue resulting from a change in the quantity of output sold. Marginal revenue indicates how much extra revenue a perfectly 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 perfectly competitive firm equates marginal revenue and marginal cost.

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INFLATION

A persistent increase in the average price level in the economy. It is measured by the inflation rate, the annual percentage change in a price index such as the Consumer Price Index (CPI) or GDP price deflator. Inflation is the most common phenomenon associated with the price level. Two related phenomena are deflation, a decrease in the price level, and disinflation, a decrease in the inflation rate. Inflation is one of two key macroeconomic problems. The other is unemployment.

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Today, you are likely to spend a great deal of time waiting for visits from door-to-door solicitors seeking to buy either a birthday gift for your grandfather or a pleather CD case. Be on the lookout for poorly written technical manuals.
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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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