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Samuelson Turnpike and Optimal Growth Theory, 1940s–1960s

Research in the History of Economic Thought and Methodology: Including a Selection of Papers Presented at the 2019 ALAHPE Conference

ISBN: 978-1-80071-141-9, eISBN: 978-1-80071-140-2

Publication date: 1 March 2021

Abstract

This chapter provides an alternative interpretation of the emergence of the “Ramsey-Cass-Koopmans” growth model, a framework which, alongside the overlapping generation model, is the dominant approach in today’s macroeconomics. By focusing on the role Paul Samuelson played through the works he developed in the turnpike literature, the author’s goal is to provide a more accurate history of growth theory of the 1940–1960s, one which started before Solow (1956) but never had him as a central reference. Inspired by John von Neumann’s famous 1945 article, Samuelson wrote his first turnpike paper by trying to conjecture an alternative optimal growth path (Samuelson, 1949 [1966]). In the 1960s, after reformulating the intertemporal utility model presented in Ramsey (1928), Samuelson began to propound it as a representative agent model. Through Samuelson’s interactions with colleagues and PhD students at the Massachusetts Institute of Technology (MIT), and given his standing in the profession, he encouraged a broader use of that device in macroeconomics, particularly, in growth theory. With the publication of Samuelson (1965), Tjalling Koopmans and Lionel McKenzie rewrote their own articles in order to account for the new approach. This work complements a recently written account on growth theory by Assaf and Duarte (2018).

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Acknowledgements

Acknowledgments

Part of this research was written while the author was visiting the Center for the History of Political Economy, Duke University, and he would like to thank the institution for its excellent hospitality and support. I am grateful to two anonymous referees for constructive and insightful contributions which improved the final version of this article. I am also grateful to Pedro Garcia Duarte, Kevin Hoover, Jeff Biddle, Michäel Assous, Ivan Boldyrev, Marcel Boumans, and John Merdomo Munévar for helpful comments and discussions, as well as to audiences at the 2018 and 2019 HES Conferences (Chicago and New York City), the 2019 ALAHPE Conference, and seminar participants at the State University of Maringa (UEM).

Citation

Chu, H. (2021), "Samuelson Turnpike and Optimal Growth Theory, 1940s–1960s", Fiorito, L., Scheall, S. and Suprinyak, C.E. (Ed.) Research in the History of Economic Thought and Methodology: Including a Selection of Papers Presented at the 2019 ALAHPE Conference (Research in the History of Economic Thought and Methodology, Vol. 39A), Emerald Publishing Limited, Leeds, pp. 87-106. https://doi.org/10.1108/S0743-41542021000039A006

Publisher

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Emerald Publishing Limited