Professional Activities
- 1995–
- Executive Council, IEFS Japan
- 1996–1999
- Executive Council, Japanese Economic Association
- 1996–2002
- Council, Japanese Economic Association
- 1997–1999
- Coeditor, Japanese Economic Review
- 1997–2003
- Coeditor, Keio Economic Studies
- 2003–2007
- Executive Council, Japan Law and Economics Association
- 2005–2008
- Council, Japanese Economic Association
- 2007–2008
- Vice President, Japanese Economic Association
- 2008–2009
- President, Japanese Economic Association
- 2011–
- Academic Director, Western Economic Association International
Journal Editor
- 1991–1994
- Associate Editor, Economic Studies Quarterly
- 1995–1997
- Associate Editor, Japanese Economic Review
- 1995–2001
- Associate Editor, Economic Theory
- 1995–
- Reviewer, Mathematical Reviews
- 1998–
- Member of Editorial Board, Annals of Mathematical Economics
- 1999–2003
- Managing Editor, Japanese Economic Review
- 2003–2006
- Editor, Law and Economics Review
- 2005–
- Managing Editor, International Journal of Economic Theory
- 2010–
- Member of Editorial Board, Technology and Investment
- 2010–
- Member of Editorial Board, Economics Research International
- 2011–
- Member of Editorial Board, Theoretical Economics Letters
- 2011–
- Board Member, Western Economic Association International