Institution: | (1) Institute of Social Sciences, University of Tsukuba, 1-1-1 Tenʼno-dai, Tsukuba, Ibaraki 306-8571, JAPAN (e-mail: hokari@social.tsukuba.ac.jp) , JP;(2) Department of Economics, University of Rochester, Rochester, NY 14627, USA (e-mail: wth2@troi.cc.rochester.edu) , US |