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In this paper I review the recent paper by DeGraba (2000) that proposes a version of Bill and Keep (called COBAK) as the efficient interconnection regime. I argue while the proposed interconnection regime is suitable for some types of interconnection it would be quite undesirable for others. I show that whether the COBAK approach is suitable for a particular type of interconnection depends on, among other things, the importance of network externalities and on the willingness of called parties versus calling parties to pay for calls.

Bill and Keep as the Efficient Interconnection Regime?