Maurice Allais

Maurice Allais (1911–2010) was a French economist and physicist whose work on markets, resource allocation, and decision theory earned the 1988 Nobel Prize in Economic Sciences.

Nobel Memorial Prize in Economic Sciences: An annual prize awarded for outstanding contributions to economic sciences. Allais received the 1988 award for contributions to market theory and efficient use of resources.
General equilibrium theory: The study of how supply, demand, and prices jointly determine outcomes across interconnected markets. Allais analyzed how an economy’s markets can coordinate through a system of prices.
Expected utility hypothesis: The theory that choices under risk maximize the probability-weighted utility of possible outcomes. Allais’s decision experiment exposed a conflict between this influential model and common choices.
Behavioral economics: The study of how psychological and social factors shape economic decisions. The Allais paradox helped establish a research program grounded in systematic departures from expected utility.
Rational choice theory: A framework that models choices as consistent preferences aimed at achieving an agent’s goals. His paradox challenged the claim that observed choices always follow a standard formal account of rationality.
Léon Walras: A French economist who developed the theory of general equilibrium. Walras’s mathematical account of interconnected markets shaped the tradition Allais extended.
Allais paradox: A choice pattern in which people violate the independence axiom of expected-utility theory. The paradox is Allais’s best-known demonstration that observed choices can conflict with a standard rationality axiom.
Independence axiom: A choice principle requiring preferences between lotteries to persist when both receive the same added alternative. The Allais paradox specifically violates this requirement of expected-utility theory.
Decision theory: The formal study of choices among alternatives under certainty, risk, or uncertainty. Allais’s paradox remains a central case in evaluating formal models of choice.
Prospect theory: A descriptive theory of choice under risk that uses reference points and nonlinear probability weighting. The Allais paradox helped motivate alternatives to expected utility, including this influential model.

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Gérard DebreuRelated: Allais was Debreu’s teacher and an early influence on his economic research.