摘要：The most network services provision (postal&telecommunications services, rail transport, air transport, etc.) were traditionaly treated as a natural monopoly. New scenario of liberalized national market and "Open network Provision", require precise and concrete economic evaluation before implementation. The present paper consider formal methodology for natural monopoly evaluation with the concept of cost subadditivity. We point out that scale and scope economies, associated with "plant (network) subadditivity", is insufficient to justify the firm monopoly for all service provision. Possible market configuration with various degrees of competition for concrete (telecommunications) branche are discussed.
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