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HERFINDAHL-HIRSHMAN INDEX: A measure of concentration of the production in an industry that's calculated as the sum of the squares of market shares for each firm. This is an alternative method of summarizing the degree to which an industry is oligopolistic and the relative concentration of market power held by the largest firms in the industry. The Herfindahl index gives a better indication of the relative market control of the largest firms than can be found with the four-firm and eight-firm concentration ratios.

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RATIONAL IGNORANCE

The decision NOT to become informed about a topic (such as what a political candidate wants to do) because the cost of acquiring the information is more than the expected benefit. The rational decision to remain ignorant about a subject is a straightforward application of utility maximization and along with the related notion of rational abstention, is a source of voter apathy and government inefficiency.

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Today, you are likely to spend a great deal of time at a garage sale seeking to buy either an AC adapter for your CD player or storage boxes for your family photos. Be on the lookout for deranged pelicans.
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