Roger Guesnerie, pioneer in economic theory, has passed away

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Roger Guesnerie (1943–2026) was a leading French economist whose work profoundly shaped modern public economics. A graduate of École polytechnique and the École nationale des ponts et chaussées (1967), he was a visiting researcher at CORE in 1971 and earned his doctorate from the University of Toulouse in 1982.

Over the course of his career, he held positions at CEPREMAP, the EHESS, and the Paris School of Economics, and maintained regular scientific ties with CORE through numerous visits. In 2000, he was appointed to the Chair of Economic Theory and Social Organization at the Collège de France.

He leaves behind a major intellectual legacy spanning optimal taxation, climate economics, and expectation formation. Known for his critical stance toward the rational expectations hypothesis, he developed original analyses of market failures that influenced generations of researchers.