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[文献書誌] 須田昌弥, 依田高典: "民営化後のJR6社の密度・範囲の経済性ならびに地域間費用格差"運輸政策研究. 7.1. 2-10 (2004)
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[文献書誌] Takanori Ida, Masaya Suda: "The Cost Structure of the Japanese Railway Industry : The Economies of Scale and Scope and the Regional Gap of the Japan Railway after the Privatization"International Journal of Transport Economics. 31.1. 23-37 (2004)
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[文献書誌] Takanori Ida, Masashi Ueda: "The Interconnection and Pricing of the Internet"M.Kagami, M.Tsuji, E.Giovannetti(eds.), Information Technology Policy and the Digital Divide, Edward Elgasr. 282-302 (2004)
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[文献書誌] Takanori Ida, Tetsuya Kuwahara: "Regulatory Reform of Japan's Electric Power Industry : Economies of Scale-and-Scope and Yardstick Competition"Asian Economic Journal. 18.4(forthcoming). (2004)
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[文献書誌] 依田高典: "公益企業の根拠:郵政民営化か否か"経済セミナー. 2004.5(近刊). (2004)