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September 14, 2026 

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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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PRIVATE GOOD: A good that's easy to keep nonpayers from consuming (called excludability), and use of the good by one person prevents use by others (termed rival consumption). Examples include almost anything that you can buy at a grocery store or shopping mall. The reason for this is that private goods are privately owned and can be sold to others for a price. For efficiency, its best for these goods to be traded through markets without any direct government involvement (unless they have a market failure). See common-property good, near-public good, public good.

     See also | good types | excludability | rival consumption | efficiency | market | exchange | market failure | common-property good | near-public good | public good |


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TAX WEDGE

The difference between demand price and supply price that is created when a tax is imposed on a market. Placing a tax on a market disrupts what otherwise would be an equilibrium equality between demand price and supply price. A tax wedge results because the tax is included in the demand price paid by buyers but not in the supply price received by sellers. With standard demand (negative slope) and supply (positive slope) curves, the incidence of the tax (who pays) is divided between buyers and sellers.

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Today, you are likely to spend a great deal of time flipping through mail order catalogs wanting to buy either a birthday gift for your grandfather or a pleather CD case. Be on the lookout for celebrities who speak directly to you through your television.
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The standard "debt" notation I.O.U. does not mean "I owe you," but actually stands for "I owe unto..."
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