Koji Yokote (written as 横手 康二 in Japanese)

Associate Professor, College of Economics, Aoyama Gakuin University, and 

Visiting Research Fellow, The University of Tokyo Market Design Center (UTMD)

Ph.D. in Economics, Waseda University, Japan, 2017

Research Interests: Market Design, Game Theory, Application of Discrete Convex Analysis to Economics

Working Papers 

• A note on assortativeness measures (with Kenzo Imamura, Suguru Otani, and Tohya Sugano)
  
  

• A note on complementarity of valuation functions (with Satoru Fujishige) 
  
  

• Rationalizing path-independent choice rules (with Isa E. Hafalir, Fuhito Kojima, and M. Bumin Yenmez)

• Behavioral bargaining theory: Equality bias, risk attitude, and reference-dependent utility (with Yoshio Kamijo)

• Efficient, fair, and strategy-proof allocation of discrete resources under weak preferences and constraints
  
  [Earlier version]

Articles in Refereed Journals

• Market design with distributional objectives
  (with Isa E. Hafalir, Fuhito Kojima, and M. Bumin Yenmez)
  Mathematics of Operations Research, forthcoming. 

• Tandem concavity with application to matching problems
  (with Satoru Fujishige)
  Operations Research Letters, 64, 107380, 2026 

• A note on ordinally concave functions
  (with Satoru Fujishige and Fuhito Kojima)
  Discrete Applied Mathematics, 376, 294-305, 2025

• A critical comparison between the gross substitutes and complements conditions

Economics Letters, 226, 111106, 2023

• Equivalence between substitutability and M-concavity for set functions under discrete transfers

Japan Journal of Industrial and Applied Mathematics, 40, 965-983, 2023

• Consistency of the doctor-optimal equilibrium price vector in job-matching markets
  Journal of Economic Theory,  197, 105346, 2021.
  
  

• Redistribution to the less productive: Parallel characterizations of the egalitarian Shapley and consensus values
  (with Takumi Kongo and Yukihiko Funaki)
  Theory and Decision, 91, 81-98, 2021
  See also publisher's correction to this article.
  
  

• On optimal taxes and subsidies: A discrete saddle-point theorem with application to job matching under constraints
  [Supplemental material]
  Journal of Mechanism and Institution Design, 5(1), 37-77, 2020
  
  

• The discrete separation theorem and price adjustment directions in markets with heterogeneous commodities
  Discrete Applied Mathematics, 275, 134–143, 2020
  
  

• Relationally equal treatment of equals and affine combinations of values for TU games
  (with Takumi Kongo and Yukihiko Funaki)
  Social Choice and Welfare, 53, 197-212, 2019
  See also a correction to this article. Social Choice and Welfare, 53, 555-555, 2019
  
  

• Weakly differentially monotonic solutions for cooperative games
  (with Andre Casajus)
  International Journal of Game Theory, 48(3), 979-997, 2019
  
  

• The balanced contributions property for equal contributors
  (with Takumi Kongo and Yukihiko Funaki)
  Games and Economic Behavior, 108, 113-124, 2018
  
  

• Coincidence of the Shapley value with other solutions satisfying covariance
  (with Yoshio Kamijo and Yukihiko Funaki)
  Mathematical Social Sciences, 89, 1-9, 2017
  
  

• Weighted values and the core in NTU games
  International Journal of Game Theory, 46(3), 631-654, 2017
  
  

• Random reduction consistency of the Weber set, the core and the anti-core
  (with Yasushi Agatsuma and Yukihiko Funaki)
  Mathematical Methods of Operations Research, 85(3), 389-405, 2017
  
  

• Monotonicity implies linearity: characterizations of convex combinations of solutions to cooperative games
  (with Yukihiko Funaki)
  Social Choice and Welfare, 49(1), 171-203, 2017
  
  

• The balanced contributions property for symmetric players
  (with Takumi Kongo)
  Operations Research Letters, 45(3), 227-231, 2017
  
  

• Weak differential monotonicity, flat tax, and basic income
  (with Andre Casajus)
  Economics Letters, 151, 100-103, 2017
  
  

• Weak differential marginality and the Shapley value
  (with Andre Casajus)
  Journal of Economic Theory, 167, 274-284, 2017
  
  

• Core and competitive equilibria: An approach from discrete convex analysis
  Journal of Mathematical Economics, 66, 1-13, 2016
  
  

• A new basis and the Shapley value
  (with Yukihiko Funaki and Yoshio Kamijo) 
  Mathematical Social Sciences, 80, 21-24, 2016
  
  

• Weak addition invariance and axiomatization of the weighted Shapley value
  International Journal of Game Theory, 44(2), 275-293, 2015
  
  

Award

• The EAAMO23 Conference's Theory Track Paper Award (2023)
  Paper title "Design on matroids: diversity vs. meritocracy" (with Isa E. Hafalir, Fuhito Kojima, and M. Bumin Yenmez)

• Waseda University Research Award (December 2018) 

• Waseda University IIjima Award and Azusa Ono Memorial Award (March 2014)