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LONG-RUN ADJUSTMENT: The combined adjustment of an industry and of each firm in the industry to an equilibrium condition that based on (1) profit maximization when all inputs are variable and (2) the entry and exit of firms. The complete adjustment is undertaken by both perfect competition and monopolistic competition. There are two parts of this adjustment process. One is the adjustment of each firm to the appropriate factory size that maximizes long-run profit. The other is the entry of firms into the industry or exit of firms out of the industry, to eliminated economic profits or economic losses. The end result of this long-run adjustment is different for the two market structures based on the fact that perfect competition has equality between price and marginal revenue, while monopolistic competition does not.

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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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Post WWI induced hyperinflation in German in the early 1900s raised prices by 726 million times from 1918 to 1923.
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