The Duopoly reference article from the English Wikipedia on 24-Jul-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Duopoly

Duopoly is a form of oligopoly where only two producers are present on a given market.

Modern US politics has been described as a duopoly since the Republican and Democratic Parties have dominated and framed policy debate. They have shaped, by default, matters of national concern for about a century and a half.

See List of political parties in the United States for a more comprehensive look at the politics of the Two-party system, Duverger's law.

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