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電気通信事業分野における競争政策の実証分析: - page 1 / 20

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No.ICP-2006-005

電気通信事業分野における競争政策の実証分析:

Actual Proof Analysis of a Competition Policy in the Telecommunication BusinessThe Vertical Integration Model and Lock-in Effects in Internet Connection Line and ISP

依田 高典*、坂平 海** Takanori Ida, Kai Sakahira

しかし、

プの ISP との間にロックインが生じ、事実上の垂直統合になっていることが懸念される。

ISP 間のロックイン効果を分析した。本論文の結論は次の通りである。NTT グループにおけ

イン効果は、FTTH の方が ADSL より大きいことが分かった。

The businesses of NIPPON TELEGRAPH AND TELEPHONE EAST CORPORATION (NTT EAST) and NIPPON TELEGRAPH AND TELEPHONE WEST CORPORATION (NTT WEST) are fundamentally limited to the local telecommunication business by the NTT law. Therefore, NTT EAST and WEST can provide Internet connection line services (the fiber to the home (FTTH) services and ADSL services etc), but they cannot run businesses of ISP (Internet Service Provider). However, ISP exists in NTT group. Therefore, we are anxious that the lock-in is generated between NTT EAST and WEST and ISP in NTT group, and NTT EAST and WEST and ISP in NTT group become de facto vertical integration. Then, we analyzed lock-in effects between NTT EAST and WEST and ISP in NTT group about each FTTH services and ADSL services. Consequently, we reached two conclusions. First, lock-in effects existed between NTT EAST and WEST and ISP in the NTT group. Second, lock-in effects of FTTH services were larger than ADSL services.

March 12, 2007

情報通信政策研究プログラム

* **

ida@econ.kyoto-u.ac.jp k-sakahira@eco05.mbox.media.kyoto-u.ac.jp

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