Correspondence
Office
Research Center for Mathematical Economics,
c/o Prof. Toru Maruyama

Department of Economics, Keio University,
2-15-45, Mita, Minato-ku, Tokyo,
108-8345, JAPAN

E-mail
maruyama@econ.keio.ac.jp
Tel
+81-3-3453-4511 (ex. 23271)
Fax
+81-3-5427-1578