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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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ALLOCATION EFFECT

A change in the allocation of resources caused by placing taxes on economic activity. By creating disincentives to produce, consume, or exchange, taxes generally alter resource allocations. The allocation effect is typically used when governments seek to discourage the production, consumption, or exchange of particular goods or activities that are deemed undesirable (such as tobacco use or pollution). This is one of two effects of taxation. The other (primary) is the revenue effect, which is the generation of revenue used to finance government operations.

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Today, you are likely to spend a great deal of time searching for rummage sales trying to buy either a wall poster commemorating yesterday or pink cotton balls. Be on the lookout for door-to-door salesmen.
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Okun's Law posits that the unemployment rate increases by 1% for every 2% gap between real GDP and full-employment real GDP.
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-- Benjamin Franklin, statesman, inventor

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