Political legitimacy

Every political order uses coercion, but almost none rests on coercion alone. Legitimacy names the property that turns power into authority: the belief, or the justified claim, that those who rule have a right to rule and that those who are ruled have a reason, even a duty, to comply. A legitimate order can rely on voluntary compliance and tolerates temporary failure; an illegitimate one must spend heavily on surveillance and force, and tends to collapse when that spending falters.

Two questions run through the literature and are easily confused:

• Normative legitimacy: under what conditions is the exercise of political power justified? This is a question for political philosophy.
• Descriptive (empirical) legitimacy: under what conditions do people believe that power is rightful and act accordingly? This is a question for sociology, psychology and political science.

An authority can be believed legitimate without being justified (a popular dictatorship), or justified without being widely believed (a fair institution facing a disinformation campaign). Many design debates in alternative governance turn on which of the two a proposal is meant to secure.

Weber's three types

Max Weber defined legitimacy empirically as a belief in the rightfulness of an order and distinguished three "pure types" of legitimate domination: traditional (sanctified custom and inherited status), charismatic (devotion to an exceptional leader) and rational-legal (belief in the legality of enacted rules and of the right of those elevated under them to issue commands). Modern bureaucratic states rest mainly on the third type, but real regimes mix all three.

Normative accounts

• Consent theories (Locke and the social-contract tradition) hold that authority is legitimate only if those subject to it have consented, actually or tacitly. Hume's objection that almost no one has ever consented remains the standard difficulty.
• Democratic and procedural accounts locate legitimacy in fair procedures in which all affected have an equal say; deliberative democrats add that decisions must be justifiable by reasons all could accept.
• Instrumental or outcome accounts judge an authority by whether it secures justice, rights or welfare better than the alternatives. Joseph Raz's "service conception" holds that authority is legitimate when following it helps subjects act on reasons that already apply to them.
• Hybrid accounts combine procedure and quality: an authority must be both fairly constituted and reasonably competent.

David Beetham argued that power is legitimate to the degree that it conforms to established rules, that the rules can be justified by beliefs shared by rulers and ruled, and that there is evidence of consent by the subordinate. His formulation bridges the normative and empirical questions.

Input, output and throughput

Fritz Scharpf distinguished input legitimacy (government by the people: participation and responsiveness) from output legitimacy (government for the people: effective solutions to shared problems). Vivien Schmidt added throughput legitimacy: the quality of the governance process itself, including transparency, accountability and inclusiveness. The triad is widely used to assess the European Union, international organisations and new forms of governance that lack an electoral base.

Empirical research

Survey research treats legitimacy as a measurable attitude. Margaret Levi, Audrey Sacks and Tom Tyler modelled "value-based legitimacy" as a felt obligation to obey and found, using survey data from African countries, that perceived trustworthiness of government and procedural justice were linked to willingness to defer to the police, courts and tax authorities. Procedural-justice research more generally finds that people accept unfavourable outcomes more readily when they believe the process treated them fairly.

• Tax compliance varies far more across countries than enforcement capacity alone would predict, a pattern often explained by "quasi-voluntary" compliance that depends on trust in government.
• The European Union is the standard test case for input/output debates: its defenders point to problem-solving capacity, its critics to a "democratic deficit".
• Citizens' assemblies and other mini-publics are designed partly to supply legitimacy to decisions that elected politicians find hard to take; whether the wider public accepts recommendations made by a randomly selected few is an open empirical question.
• Self-governing experiments such as Rojava, Zapatista municipalities or Freetown Christiania show that legitimacy can be produced locally without recognition by any state, but also that external non-recognition limits what such orders can do.
• Algorithmic decision systems raise a new version of the problem: a decision may be accurate yet unaccountable, as discussed under algorithmic legitimacy.

• Conceptual inflation: "legitimacy" is used for consent, popularity, legality, justice and stability at once. Critics argue that the word often adds rhetorical weight without analytical content.
• Measurement problems: survey answers about trust can track short-term satisfaction with incumbents rather than deep acceptance of a regime; in authoritarian settings respondents may falsify preferences.
• Legitimacy without justice: purely empirical definitions can certify oppressive regimes that are widely supported, which is why many philosophers insist on a normative test.
• Output legitimacy as a loophole: anchoring legitimacy in performance can be used to excuse technocratic or authoritarian rule as long as it delivers growth, a claim made explicitly by some single-party states.
• Philosophical anarchism (for example A. John Simmons and Robert Paul Wolff) argues that no existing state is fully legitimate in the strong sense of generating a general duty to obey, even if some states are better than others.

Legitimacy is indispensable for institution design because it determines how much an order can rely on voluntary cooperation. Comparative work suggests that procedural fairness, impartial administration and perceived trustworthiness matter at least as much as material performance. For new governance forms, from DAOs to network states, the practical lesson is that technical validity of a rule (it was passed by the correct vote or executed by the correct code) is not the same as legitimacy in the eyes of those it binds.

• Fabienne Peter, "Political Legitimacy", Stanford Encyclopedia of Philosophy
• Vivien A. Schmidt, "Democracy and Legitimacy in the European Union Revisited" (2013)
• Levi, Sacks and Tyler, "Conceptualizing Legitimacy, Measuring Legitimating Beliefs" (2009)
• Bruce Gilley, "The meaning and measure of state legitimacy" (2006)
• Max Weber, Economy and Society (University of California Press, 1978)
• David Beetham, The Legitimation of Power (Macmillan, 1991)