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OLIGOPOLY, CONCENTRATION: Oligopoly is a market structure that contains a small number of relatively large firms, meaning oligopoly markets tend to be concentrated. A small number of large firms account for a majority of total output. Concentration unto itself is not necessarily bad, but it often leads to inefficient behavior, such as collusion and nonprice competition. Concentration is measured in three ways--market share, concentration ratio, Herfindahl index.

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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 calling an endless list of 800 numbers trying to buy either a T-shirt commemorating the first day of winter or software that won't crash your computer. Be on the lookout for strangers with large satchels of used undergarments.
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Much of the $15 million used by the United States to finance the Louisiana Purchase from France was borrowed from European banks.
"The best way to cheer yourself up is to try to cheer somebody else up."

-- Mark Twain

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