An election is a ecision-making process by which a population chooses an individual to hold formal office. This is the usual mechanism by which modern democracy fills offices in the legislature, sometimes in the executive and judiciary, and for regional and local government. This process is also used in many other private and business organizations, from clubs to voluntary associations and corporations. As Montesquieu pointed out in Book II, Chapter 2 of "The Spirit of Laws," in the case of elections in either a republic or a democracy, voters alternate between being the rulers of the country as well as being the subjects of the government. By the act of voting, the people operate in a sovereign (or ruling) capacity, acting as "masters" to select their government's "servants." The unique characteristic of democracies and republics is the recognition that the only legitimate source of power for a government "of the people, by the people, and for the people" is the consent of the governed—the people themselves.