Contact

Faculty of Economics, Keio University

Mita 2-15-45, Minato-ku

Tokyo 108-8345, Japan

Email: sakai<at>sakaioffice<dot>.co

Primary Current Positions

Professor of Economics, Keio University

Co-founding Director, Economics Design Inc.

Independent Director, Prudential of Japan

Other Main Current Positions

Chief Economist, Due diligence & Deals co., 2018-present

Advisor, Stake Technologies Pte. Ltd., 2021-present

Advisor in Economic Design, Gaudiy Inc., 2019-present

General Director, Tokyo Center of Economic Research, 2020-present

Advisor, Japan Blockchain Association, 2021-present

Advisor, Institution for a Global Society, 2023-present

Academic Positions

Professor, Faculty of Economics, Keio University, 2014-present

Associate Professor, Faculty of Economics, Keio University, 2011-2014

Associate Professor, Department of Economics, Yokohama National University, 2006-2011

Associate Professor, International College of Arts and Sciences, Yokohama City University, 2005-2006

Personal

Born July 1975 in Hiroshima (Japan), married, two children, Japanese

Language

  Japanese (native), English (fluent)

Education

Ph.D. in Economics, University of Rochester, 2005

M.A. in Economics, University of Rochester, 2003

M.A. in Economics, Kobe University, 2000

B.A. in Commerce, Waseda University, 1998

Research Fields

Collective Choice, Market Design, Scoring and Rating, Cryptocurrencies

Honors

3rd ranked by Weekly Diamond’s Best Economics Books for Economics of How to Choose (『決め方の経済学』), 2016

4th ranked by Shinsho Prize for Doubting the Majority Vote (『多数決を疑う』), 2016

Keio Gijuku Prize, Keio University, 2015

Best Teacher Prize, Yokohama National University, 2009

Published Papers in Refereed International Journals

 (Author names are all alphabetically ordered)

1.         Masuda, R. Mikami, S., Sakai, T., Serizawa, and T. Wakayama (2022) “The net effect of advice on strategy-proof mechanisms: an experiment for the Vickrey auction,” Experimental Economics

2.         Okamoto, N. and Sakai, T. (2019) “The Borda rule and the pairwise-majority-loser revisited,”  Review of Economic Design

3.         Sakai, T. (2017) “Considering collective choice: The Route 328 problem in Kodaira City,” Japanese Economic Review

4.         Sakai, T. (2016) “Limit representations of intergenerational equity,” Social Choice and Welfare

5.         Sakai, T. (2015) “A search for the general will in a spatial model,” Japanese Economic Review

6.         Sakai, T. (2013) “Axiomatizations of second price auctions with a reserve price,” International Journal of Economic Theory

7.         Sakai, T. (2013) “An equity characterization of second price auctions when preferences may not be quasilinear,” Review of Economic Design

8.         Sakai, T. (2012) “Fair waste pricing: an axiomatic analysis to the NIMBY problem,” Economic Theory

9.         Sakai, T. and Wakayama, T. (2012) “Strategy-proofness, tops-only, and the uniform rule,” Theory and Decision

10.     Sakai, T. (2011) “A note on strategy-proofness from the doctor side in matching with contracts,” Review of Economic Design

11.     Sakai, T. (2010) “A characterization and an impossibility of finite length anonymity for infinite generations,” Journal of Mathematical Economics

12.     Sakai, T. (2010) “Intergenerational equity and an explicit construction of welfare criteria,” Social Choice and Welfare

13.     Bochet, O. and Sakai, T. (2010) “Secure implementation in allotment economies,” Games and Economic Behavior

14.     Hayashi, T. and Sakai, T. (2009) “Nash implementation of competitive equilibria in the job-matching market,” International Journal of Game Theory

15.     Fujinaka, Y. and Sakai, T. (2009) “The positive consequence of strategic manipulation in indivisible good allocation,” International Journal of Game Theory

16.     Sakai, T. (2009) “Walrasian social orderings in exchange economies,” Journal of Mathematical Economics

17.     Sakai, T. (2008) “Second price auctions on general preference domains: two characterizations,” Economic Theory

18.     Fujinaka, Y. and Sakai, T. (2007) “The manipulability of fair solutions in allocation of an indivisible object with money,” Journal of Public Economic Theory

19.     Sakai, T. (2007) “Fairness and implementability in allocation of indivisible objects with monetary compensations,” Journal of Mathematical Economics

20.     Fujinaka, Y. and Sakai, T. (2007) “Maskin monotonicity in economies with indivisible goods and money,” Economics Letters

21.     Bochet, T. and Sakai, T. (2007) “Strategic manipulations of multi-valued solutions in economies with indivisibilities,” Mathematical Social Sciences

22.     Ju, B.-G., Miyagawa, E., and Sakai, T. (2007) “Non-manipulable division rules in claim problems and generalizations,” Journal of Economic Theory

23.     Sakai, T. (2006) “Equitable intergenerational preferences on restricted domains,” Social Choice and Welfare

24.     Sakai, T. and Shimoji, S. (2006) “Dichotomous preferences and the possibility of Arrovian social choice,” Social Choice and Welfare

25.     Sakai, T. (2003) “Intergenerational preferences and sensitivity to the present,” Economics Bulletin

26.     Sakai, T. (2003) “An axiomatic approach to intergenerational equity,” Social Choice and Welfare

Books

I have (co-)authored a dozen of books in Japanese. Among them, Doubting the Majority Vote (『多数決を疑う』) appeared in a number of entrance examinations including Keio University, Kyoto University, and Metropolitan Police Department. A part of the book also appears in a high-school textbook of National Language by Taishukan Publishing Co., Ltd. The book is translated into Traditional Chinese and Korean. The list of my books can be found in my Japanese C.V., which is available upon request.