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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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OVERT COLLUSION: A formal, usually secret, collusion agreement among competing firms (mostly oligopolistic firms) in an industry designed to control the market, raise the market price, and otherwise act like a monopoly. Also termed explicit collusion, the distinguishing feature of overt collusion is a formal agreement. This should be contrasted with implicit or tacit collusion that does not involve a formal, explicit agreement.

     See also | collusion | oligopoly | industry | market control | price | monopoly | competition among the few | explicit collusion | implicit collusion | tacit collusion | cartel | antitrust laws |


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OVERT COLLUSION, AmosWEB GLOSS*arama, http://www.AmosWEB.com, AmosWEB LLC, 2000-2026. [Accessed: July 22, 2026].


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MACROECONOMIC SECTORS

The four aggregate sectors of the macroeconomy--household, business, government, and foreign--that reflect four key macroeconomic functions and are responsible for four expenditures on gross domestic product. These four sectors are the primary "actors" on the macroeconomic stage. Macroeconomic theories then explain macroeconomic phenomena by exploring the interaction among these four sectors.

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Today, you are likely to spend a great deal of time waiting for visits from door-to-door solicitors wanting to buy either decorative picture frames or storage boxes for your income tax returns. Be on the lookout for broken fingernail clippers.
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Woodrow Wilson's portrait adorned the $100,000 bill that was removed from circulation in 1929. Woodrow Wilson was removed from circulation in 1924.
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