Oligarchy (from Greek ὀλιγαρχία (oligarkhía); from ὀλίγος (olígos), meaning "few", and ἄρχω (arkho), meaning "to rule or to command") is a form of power structure in which power actually rests with a small number of people. These people might be distinguished by nobility, wealth, family ties, education or corporate, religious or military control. Such states are often controlled by a few prominent families who typically pass their influence from one generation to the next, but inheritance is not a necessary condition for the application of this term.
Throughout history, oligarchies have often been tyrannical, relying on public obedience or oppression to exist. Aristotle pioneered the use of the term as a synonym for rule by the rich, for which another term commonly used today is .
Especially during the fourth century BC, after the restoration of democracy from oligarchical coups, the Athenians used the drawing of lots for selecting government officers in order to counteract what the Athenians saw as a tendency toward oligarchy in government if a professional governing class were allowed to use their skills for their own benefit. They drew lots from large groups of adult volunteers that pick selection technique for civil servants performing judicial, executive, and administrative functions (archai, boulē, and hēliastai). They even used lots for posts, such as judges and jurors in the political courts (nomothetai), which had the power to overrule the Assembly.
Some contemporary authors have characterized current conditions in the United States as oligarchic in nature.Simon Johnson wrote that "the reemergence of an American financial oligarchy is quite recent", a structure which he delineated as being the "most advanced" in the world.Jeffrey A. Winters wrote that "oligarchy and democracy operate within a single system, and American politics is a daily display of their interplay." The top 1% of the US population by wealth in 2007 had a larger share of total income than at any time since 1928. In 2011, according to PolitiFact and others, the top 400 wealthiest Americans "have more wealth than half of all Americans combined."