HERFINDAHL 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 |

HERFINDAHL INDEX, AmosWEB GLOSS*arama, http://www.AmosWEB.com, AmosWEB LLC, 2000-2026. [Accessed: March 12, 2026].

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The trading of votes to ensure a favorable outcome for two or more separate decisions. Logrolling occurs when each of two people agree to vote for the other's project to ensure that both are passed. A votes for B and B votes for A. Logrolling is commonly used when neither decision is able to obtain the necessary majority of the votes needed for passage on their own accord. Explicit logrolling is when each of two voters agree to cast separate votes for two separate programs. Implicit logrolling is when two separate programs or policies are combined into a single package, which is then subject to a single vote. Logrolling can generate either an efficient or an inefficient allocation of resources, meaning that efficiency is irrelevant to the logrolling process.

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