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| Mark J. Machina | |
|---|---|
| Name | Mark J. Machina |
| Birth date | 1954 |
| Occupation | Economist, Decision Theorist |
| Alma mater | University of California, Berkeley; University of Oklahoma |
| Known for | Machina paradoxes; non-expected utility theory; generalized expected utility |
Mark J. Machina was an American economist and decision theorist known for influential critiques of expected utility theory and for proposing alternative models of choice under uncertainty. His work intersected with scholars and institutions across Game theory, Welfare economics, Behavioral economics, and Mathematical economics, influencing debates involving figures such as John von Neumann, Oskar Morgenstern, Kenneth Arrow, John Harsanyi, and Daniel Kahneman. Machina's research engaged with policy and academic communities at universities and research organizations including University of Chicago, Princeton University, Harvard University, Stanford University, and National Bureau of Economic Research.
Machina was born in 1954 and completed undergraduate and graduate training in economics and mathematics, earning degrees from institutions including the University of Oklahoma and the University of California, Berkeley. During his formative years he encountered the work of Leonid Hurwicz, Kenneth Arrow, Gerard Debreu, and John von Neumann, which shaped his interest in axiomatic foundations and normative models. His doctoral studies emphasized rigorous treatment of preferences, utility, and choice under uncertainty, aligning with traditions established by Frank Ramsey, John Maynard Keynes, and Isaac Levi.
Machina held faculty and research positions at major research universities and policy institutes, collaborating with scholars from the University of California system, Massachusetts Institute of Technology, Yale University, and London School of Economics. He served as a visiting scholar or lecturer at centers including the National Bureau of Economic Research, the Cowles Foundation, and the Russell Sage Foundation. Machina participated in conferences and seminars alongside economists such as Kenneth Arrow, Amartya Sen, Robert Aumann, Roger Myerson, and Thomas Schelling, and contributed to workshops at organizations like the Institute for Advanced Study and the RAND Corporation.
Machina is best known for foundational contributions to non-expected utility theory, challenging the universal validity of Expected utility theory as developed by John von Neumann and Oskar Morgenstern. He introduced generalized preference representations that extended work by Leonid Hurwicz and paralleled developments by Allais-critics and Ellsberg-motivated ambiguity research by Daniel Ellsberg, Daniel Kahneman, and Amos Tversky. Machina formulated conditions under which observed violations of expected utility—documented in experiments associated with Maurice Allais, Ellsberg, and Markowitz (Harry Markowitz)—could be rationalized using alternative axioms. His models addressed comparative risk aversion, state-dependent utilities, and continuity axioms discussed by John Harsanyi and Kenneth Arrow.
Machina introduced thought experiments and paradoxes—now widely referenced as Machina paradoxes—that illustrated choices inconsistent with expected utility but coherent under generalized utility frameworks. These paradoxes are discussed alongside classic examples like the Allais paradox and the Ellsberg paradox in the literature of Behavioral economics, Experimental economics, and Philosophy of probability. He proposed structures such as the Machina smooth model and models of nonexpected utility that bear relation to work by Peter Wakker, Schmeidler, Gerd Gigerenzer, and Leonard Savage. His formulations influenced subsequent theoretical constructs including rank-dependent utility, cumulative prospect theory developed by Daniel Kahneman and Amos Tversky, and models of ambiguity aversion advanced by Itzhak Gilboa and David Schmeidler.
Machina authored influential articles and working papers published in leading journals and edited volumes, engaging with audiences at the American Economic Association and in periodicals such as the Journal of Economic Theory, Econometrica, The American Economic Review, and Theory and Decision. Selected works include his seminal papers on violations of expected utility, formalizations of generalized utility representations, and analyses of preference behavior under ambiguity and risk. His papers are discussed and cited by scholars including Kenneth Arrow, Daniel Kahneman, Amos Tversky, Leonid Hurwicz, Peter Wakker, and Itzhak Gilboa.
Machina's contributions were recognized by citations, invitations to major conferences, and positions at prominent research centers. His work received attention alongside laureates such as John Nash, Kenneth Arrow, Leonid Hurwicz, and Daniel Kahneman in discussions of foundations of decision theory and welfare economics. He was frequently invited to give named lectures, to serve on editorial boards for journals like Econometrica and the Journal of Economic Theory, and to consult for institutions engaged in policy analysis and behavioral research.
Category:American economists Category:Decision theorists