Recent Research Interests

My research interests are mainly in monotone comparative statics and revealed preference theory.

In many economic models, monotone comparative statics plays a key role to derive clear-cut theoretical conclusions; for example, one could think of normality of a demand, strategic complementarity in a game, and others. Then, it is important to have sound sufficient conditions that ensure monotone comparative statics, in addition to clarifying various implications derived from it. For these purposes, I’m particularly working on lattice-based theory of comparative statics, which is known to be applicable to wide-range of economic models.

On the other hand, as monotone comparative statics does, behavioral and/or mathematical assumptions in a model could significantly affect the conclusion of an economic analysis. Moreover, the choice of a model itself often matters. Given this, it is important to have a test to see if a specific economic model, perhaps jointly with some additional assumptions, is consistent with observed economic data. Actually, constructing such a test is nothing but the primal objective of revealed preference theory. The most well-known revealed preference test would be Afriat’s theorem, which tests the classical utility maximization model, but there is no reason to stick to single agent decision models. I’m currently working on several revealed preference analyses of game theoretic frameworks, as well as those of individual decision models.

Selected Publications

  • “Welfare variations and comparative statics of the demand.” Economic Theory 53(2), 2013 
  • “An existence theorem for Cournot-Walras equilibria in a monopolistically competitive economy.” Journal of Mathematical Economics, 46(6), 2010.

Further Information