Economic Definition of special interest group. Defined.
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Term special interest group Definition: A group that has more to gain or lose from some candidate, issue, or policy and thus tries extra hard to ensure that the political system is aware of their preferences. Some special interest groups can be fairly tame, merely voting in elections for their chosen candidate, while others are quite active. The more active ones form political action committees and undertake all forms of lobbying (legal and illegal). The ultimate success of special interest groups arises from the inclination of other people to choose rational ignorance and rational abstention.