Nahoko Mitsuyama Waseda University   Nishi-Waseda Bldg. 7F, 1-21-1 Nishi-Waseda Shinjuku-ku, Tokyo 169-0051 Japan   sakai_mitsuyama@akane.waseda.jp             JEL Areas: L5 : Regulation and Industrial Policy: General L8 : Industry Studies: Services: General