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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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SECOND RULE OF SUBJECTIVITY

The second of seven basic rules of the economy, stating that market prices are determined by subjective values and the preferences of buyers and resource owners. Contrary to popular opinion, prices and costs are not immutably facts of nature, but are ultimately based on what people are willing to pay or accept.

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Today, you are likely to spend a great deal of time strolling around a discount warehouse buying club trying to buy either car battery jumper cables or a dozen high trajectory optic orange golf balls. Be on the lookout for defective microphones.
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Helping spur the U.S. industrial revolution, Thomas Edison patented nearly 1300 inventions, 300 of which came out of his Menlo Park "invention factory" during a four-year period.
"After climbing a great hill, one finds many more hills to climb. "

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