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July 18, 2025 

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ECONOMICS: A social science that studies the allocation of limited resources to the production of goods and services used to satisfy consumer's unlimited wants and needs. Five notable phrases contained in this definition that need further study are: (1) social science, (2) allocation, (3) limited resources, (4) production, and (5) unlimited wants and needs.

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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.

     See also | market share | oligopoly | concentration ratio | market control | antitrust laws |


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HERFINDAHL-HIRSHMAN INDEX, AmosWEB GLOSS*arama, http://www.AmosWEB.com, AmosWEB LLC, 2000-2025. [Accessed: July 18, 2025].


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ADVERSE SELECTION

An inefficient, bad, or adverse outcome of a market exchange that results because buyers and/or sellers make decisions based on asymmetric information. This commonly results in a market that exchanges a lesser quality good, what is termed the market for lemons. Two related problems resulting from asymmetric information are moral hazard and the principal-agent problem. Two methods of lessoning the problem of adverse selection are signalling and screening.

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Today, you are likely to spend a great deal of time searching the newspaper want ads seeking to buy either an extra large beach blanket or a large flower pot shaped like a Greek urn. Be on the lookout for fairy dust that tastes like salt.
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Natural gas has no odor. The smell is added artificially so that leaks can be detected.
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