Roger Guesnerie (17 February 1943 – 4 January 2026) was a French academic and economist. He was last the Chaired Professor of Economic Theory and Social Organization of theCollège de France, Director of Studies at theÉcole des hautes études en sciences sociales, and the chairman of the board of directors of theParis School of Economics.

Guesnerie was born inSainte-Gemmes-le-Robert on 17 February 1943.^[1][2] He studied atÉcole Polytechnique and theÉcole Nationale des Ponts et Chaussées, and received his doctorate in economics from theUniversity of Toulouse in 1982. He taught at theLondon School of Economics, the École Polytechnique, and atHarvard University.^[3] Guesnerie published widely in economics, including inpublic economics, in the theory of incentives and economic mechanisms, and in the theory of general economic equilibrium.

Guesnerie died in Paris on 4 January 2026, at the age of 82.^[4][1]

Guesnerie was elected as president of several scholarly societies, notably the French Association of Economic Sciences (2002–2003), theEconometric Society (1996), and theEuropean Economic Association (1994). Guesnerie was elected as a foreign honorary member of theAmerican Economic Association and as a foreign member of theAmerican Academy of Arts and Sciences. He served as co-editor ofEconometrica (1984–1989) and as foreign editor of theReview of Economic Studies. In France, Guesnerie's research has been recognized with theCNRS Silver Medal; he was appointed a knight of theLegion of Honour in 2005 and knight of theOrdre national du Mérite in 1987.

• Roger Guesnerie and Henry Tulkens, 2008,The Design of Climate Policy, MIT Press.^[5]
• "Assessing Rational Expectations 2: Eductive stability in economics", MIT Press, 2005, 453p.^[6]
• "Assessing Rational Expectations: Sunspot multiplicity and economic fluctuations", MIT Press, 2001, 319 p.ISBN 978-0-262-26279-8
• "A contribution to the pure theory of taxation", Cambridge University Press, 1995, 301 pages^[7]

• Guesnerie, Roger;Roberts, Kevin W.S. (January 1984)."Effective policy tools and quantity controls"(PDF).Econometrica.52 (1):59–86.doi:10.2307/1911461.JSTOR 1911461.
• Guesnerie, Roger (1975). "Pareto optimality in non-convex economies".Econometrica.43 (1):1–29.doi:10.2307/1913410.JSTOR 1913410.MR 0443877. with"Errata".Econometrica. Vol. 43, no. 5–6. 1975. p. 1010.doi:10.2307/1911353.JSTOR 1911353.MR 0443878.

Donald J. Brown credited Guesnerie's "seminal" paper with the "major methodological innovation in the general equilibrium analysis of firms with pricing rules", "the introduction of the methods of nonsmooth analysis, as a [synthesis] of global analysis (differential topology) and [of] convex analysis."^[8] This paper introduced cone of interior displacements of Dubovickii and Miljutin into economics.^[9][10]

• "General equilibrium when Some firms follow special pricing rules", (with Egbert Dierker and W. Neuefeind),Econometrica, 53, 6, 1985

This paper stimulated a subfield of economics, devoted to pricing rules, as discussed byJacques Drèze:

"Starting with a paper inEconometrica by Dierker, Guesnerie and Neuefeind (1985), a theory of general equilibrium has developed for economies with non-convex production sets, where firms follow well-defined pricing rules. In particular, existence theorems of increasing generality cover (to some extent, because of various differences in assumptions) the case of Ramsey-Boiteux pricing. Those interested primarily in applications might express skepticism, perhaps even horrified skepticism, upon realizing that 90 pages of a serious economics journal—a 1988 issue ofThe Journal of Mathematical Economics—were devoted to existence proofs of equilibrium in non-convex economies, under alternative formulations of the assumption thatmarginal cost pricing entails bounded losses at normalized prices. Still, I think that economic research must cover the whole spectrum from concrete applications to that level of abstraction."^[11]

• Guesnerie, Roger;Roberts, Kevin W.S. (February–March 1987). "Minimum wage legislation as a second best policy".European Economic Review.31 (1–2):490–498.doi:10.1016/0014-2921(87)90067-5.
• Guesnerie, Roger (1989). "First-best allocation of resources with nonconvexities in production". In Cornet, Bernard; Tulkens, Henry (eds.).Contributions to Operations Research and Economics: The twentieth anniversary of CORE (Papers from the symposium held in Louvain-la-Neuve, January 1987). Cambridge, MA: MIT Press. pp. 99–143.ISBN 978-0-262-03149-3.MR 1104662.

• Homepage of Roger Guesnerie (Paris School of Economics)

• 1943 births
• 2026 deaths
• French civil engineers
• École polytechnique alumni
• École des Ponts ParisTech alumni
• Corps des ponts
• Presidents of the Econometric Society
• Academic staff of the Collège de France
• Fellows of the American Academy of Arts and Sciences
• General equilibrium theorists
• Mathematical economists
• Public economists
• Microeconomists
• Macroeconomists
• Econometricians
• Fellows of the Econometric Society
• 21st-century French economists
• 20th-century French economists
• Knights of the Legion of Honour
• Knights of the Ordre national du Mérite

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