Competition and Regulation in Network Industries, Vol. 12, No.4. is a special issue on "Ownership Unbundling in Network Industries". The special issue is set up with reference to the research project UNECOM. It brings together insights from the unbundling discussion in several network industries. Gert Brunekreeft and Roland Meyer acted as guest editors.

Contents:

• Meyer, R., Benchmarking Economies of Vertical Integration in U.S. Electricity Supply: An Application of DEA
• Makholm, J., Real Unbundlings: The Foundation for a Competitive Gas Market in the United States
• Knieps, G., Regulatory Unbundling in Telecommunications
• Weiss, H.-J., Unbundling of Non-Profitable Rail Infrastructures

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