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January 15, 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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ASSUMPTIONS, PRODUCTION POSSIBILITIES

The four key assumptions underlying production possibilities analysis are: (1) resources are used to produce one or both of only two goods, (2) the quantities of the resources do not change, (3) technology and production techniques do not change, and (4) resources are used in a technically efficient way.

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APLS

PURPLE SMARPHIN
[What's This?]

Today, you are likely to spend a great deal of time searching for a specialty store seeking to buy either a pair of red and purple designer socks or a T-shirt commemorating Thor Heyerdahl's Pacific crossing aboard the Kon-Tiki. Be on the lookout for door-to-door salesmen.
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A scripophilist is one who collects rare stock and bond certificates, usually from extinct companies.
"My philosophy of life is that if we make up our mind what we are going to make of our lives, then work hard toward that goal, we never lose - somehow we win out."

-- President Ronald Reagan

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Food and Agricultural Organization
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