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MARGINAL REVENUE: The change in total revenue resulting from a change in the quantity of output sold. For a perfectly competitive firm, marginal revenue is equal to price.

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PERFECT COMPETITION, LONG-RUN PRODUCTION ANALYSIS

In the long run, a perfectly competitive firm adjusts plant size, or the quantity of capital, to maximize long-run profit. In addition, the entry and exit of firms into and out of a perfectly competitive market guarantees that each perfectly competitive firm earns nothing more or less than a normal profit. As a perfectly competitive industry reacts to changes in demand, it traces out positive, negative, or horizontal long-run supply curve due to increasing, decreasing, or constant cost.

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Today, you are likely to spend a great deal of time searching the newspaper want ads trying to buy either a rotisserie oven that can also toast bread or a flower arrangement in a coffee cup for your father. Be on the lookout for deranged pelicans.
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Three-forths of the gold mined each year is used to manufacture jewelry.
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