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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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SEASONAL UNEMPLOYMENT

Unemployment attributable to relatively regular and predictable declines in particular industries or occupations over the course of a year, often corresponding with the climatic seasons. Unlike cyclical unemployment, which may or may not occur at any given time, seasonal unemployment is an essential part of many jobs. For example, a regular, run-of-the-mill, department store Santa Clause can count on 11 months of unemployment each year. Seasonal unemployment is one of four unemployment sources. The other three are cyclical unemployment, frictional unemployment, and structural unemployment.

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BLACK DISMALAPOD
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Today, you are likely to spend a great deal of time at an auction looking to buy either a replacement washer for your kitchen faucet or a stretchable, flexible watch band. Be on the lookout for deranged pelicans.
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Two and a half gallons of oil are needed to produce one automobile tire.
"Advice is like snow ‚ the softer it falls, the longer it dwells upon and the deeper it sinks into the mind. "

-- Samuel Taylor Coleridge, poet

WPO
Weakly Pareto Optimal
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