Public choice theory is the use of economic methods to study politics and government. It assumes that voters, politicians, bureaucrats and interest groups act largely in their own interest, just as consumers and firms are assumed to do in markets, and asks what outcomes follow from that. Its most cited conclusion is that government decisions can fail to serve the public interest for predictable reasons, which economists call "government failure", the political counterpart of market failure.
The field is most closely associated with James M. Buchanan and Gordon Tullock, whose book The Calculus of Consent (1962) laid out an economic theory of constitutions and voting rules. Buchanan received the Nobel Memorial Prize in Economic Sciences in 1986 "for his development of the contractual and constitutional bases for the theory of economic and political decision-making". The approach overlaps with social choice theory, which studies how individual preferences can be combined into group decisions, and with game theory. It is often linked to the "Virginia school", centered at the University of Virginia, Virginia Tech and George Mason University.
Public choice theory in plain terms
Imagine a residents' committee deciding how to spend the building's maintenance fund. Each member says they want what is best for everyone, but the person on the top floor pushes for a new lift, the one with a garden flat wants new fencing, and the treasurer wants a bigger budget for the committee itself. Few residents attend meetings, so the most motivated voices win.
Public choice theory looks at governments the same way. It does not assume officials are bad people; it assumes they are ordinary people responding to incentives such as re-election, budgets, career prospects and pressure from organized groups. From that starting point it tries to explain why some policies get chosen even when they cost the public more than they deliver.
Key ideas
- Rational ignorance. Anthony Downs argued in An Economic Theory of Democracy (1957) that because one vote rarely decides an election, it is rational for most voters to spend little time learning about policy.
- The median voter. Duncan Black (1948) and Downs showed that, under certain conditions, parties competing for votes move toward the preferences of the middle voter.
- Concentrated benefits, dispersed costs. Mancur Olson's The Logic of Collective Action (1965) explained why small, organized groups often beat large, unorganized ones: each member of a small group gains a lot and has reason to lobby, while the cost to each taxpayer is small. This links to the free-rider problem.
- Rent-seeking. Tullock (1967) and Anne Krueger (1974) described how firms spend resources to obtain government favors such as tariffs, licences or subsidies; see rent-seeking and rent seekers. The resources spent competing for these favors are a social cost.
- Logrolling. Legislators trade votes ("I'll support your project if you support mine"), which can pass bundles of spending that a majority would reject one by one.
- Bureaucracy. William Niskanen (1971) modelled agencies as seeking larger budgets, which can push public spending above efficient levels.
- Regulatory capture. Agencies may come to serve the industries they regulate; see regulatory capture.
Kenneth Arrow's impossibility theorem (1951), from social choice theory, added a deeper point: no voting rule can turn individual rankings into a group ranking that satisfies a small set of reasonable fairness conditions in every case. Collective choices can therefore depend on the voting procedure itself.
Applications and policy influence
Public choice ideas are used to explain persistent farm subsidies, protective tariffs and special tax breaks; the growth of government spending and deficits, since voters enjoy spending today while costs fall on future taxpayers through government borrowing; the timing of policy around elections; and the design of independent institutions. The case for independent central banks, fiscal rules, balanced-budget requirements and constitutional limits on taxation draws partly on public choice arguments that politicians face short-term incentives. The approach also informed deregulation and privatization programs from the late 1970s onwards, and debates about crony capitalism.
Elinor Ostrom, who shared the 2009 economics prize, worked in a related tradition (the Bloomington school) and showed that communities can sometimes manage shared resources well without either markets or central government, which qualified pessimistic readings of the tragedy of the commons.
Criticism
Critics from several directions question public choice theory. Political scientists Donald Green and Ian Shapiro, in Pathologies of Rational Choice Theory (1994), argued that many rational-choice models of politics had weak empirical support; for example, people vote in large numbers even though rational-ignorance logic suggests they should not. Others argue that the theory understates genuine public-spiritedness, ideology and the role of ideas in politics. Some scholars on the left see the approach as built to favor smaller government, a debate sharpened by the historian Nancy MacLean's 2017 book Democracy in Chains, which was itself strongly criticized by economists and historians for its reading of Buchanan's work. Defenders reply that the theory applies the same assumptions to markets and governments, so it is a consistency check rather than an ideology, and that it can justify government action where market failures are larger than government failures. Many economists use public choice tools while also weighing bounded rationality and institutional detail.