Dr. Kimio Morimune Institute of Econ. Research, Kyoto University Sakyo Kyoto 606-8501, Japan morimune@kier.kyoto-u.ac.jp (Preferred), c53941@sakura.kudpc.kyoto-u.ac.jp fax 81-75-753-7118 telephone 81-75-753-7112 home telfax 81-77-529-2267