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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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PER UNIT TAX

A tax specified as a percentage of the quantity of a good, service, asset, or other activity. Per unit taxes are often imposed on specific goods or markets. A common per unit tax is that levied on gasoline. People pay a given tax for each gallon of gasoline purchased, regardless of the price of gasoline. An alternative is an ad valorem tax, with is a tax specified as a percentage of the value or price of a good.

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RED AGGRESSERINE
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Today, you are likely to spend a great deal of time looking for a downtown retail store looking to buy either a how-to book on fine dining or a coffee cup commemorating the first day of winter. Be on the lookout for the happiest person in the room.
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Three-forths of the gold mined each year is used to manufacture jewelry.
"A ship ought not to be held by one anchor, nor life by a single hope. "

-- Epictetus, philosopher

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