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September 5, 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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ABSTRACTION

Simplifying the complexities of the real world by ignoring (hopefully) unimportant details while doing economic analysis. Abstraction is an essential feature of the scientific method. Hypothesis verification, model construction, and comparative static analysis are not possible without abstraction.

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Today, you are likely to spend a great deal of time at a going out of business sale seeking to buy either a rotisserie oven that can also toast bread or a flower arrangement in a coffee cup for your father. Be on the lookout for bottles of barbeque sauce that act TOO innocent.
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It's estimated that the U.S. economy has about $20 million of counterfeit currency in circulation, less than 0.001 perecent of the total legal currency.
"The only profit center is the customer."

-- Peter Drucker, educator

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