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May 10, 2026 

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IMPERFECT COMPETITION: Any markets or industries that do not match the criteria for perfect competition. The key characteristics of perfect competition are: (1) a large number of small firms, (2) identical products sold by all firms, (3) freedom of entry into and exit out of the industry, and (4) perfect knowledge of prices and technology. These four characteristics are essentially impossible to match in the real world.

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PER UNIT TAX: A tax that is specified as a fixed amount for each unit of a good sold. Federal excise taxes on gasoline and cigarettes fall into this per unit tax category.

     See also | tax | market | tax incidence | ad valorem tax | excise tax |


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PER UNIT TAX, AmosWEB GLOSS*arama, http://www.AmosWEB.com, AmosWEB LLC, 2000-2026. [Accessed: May 10, 2026].


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MONOPOLISTIC COMPETITION, LONG-RUN ADJUSTMENT

A monopolistically competitive industry undertakes a two-part adjustment to equilibrium in the long run. One is the adjustment of each monopolistically competitive 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 eliminate economic profit or economic loss. The end result of this long-run adjustment is two equilibrium conditions--one for profit maximization, the other for zero economic profit.

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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 travel case for you toothbrush or a looseleaf notebook binder. Be on the lookout for gnomes hiding in cypress trees.
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Three-forths of the gold mined each year is used to manufacture jewelry.
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