The Interdependent Telecommunications Demand and Efficient Price Structure

Rapid growth of mobile telecommunications is a widespread phenomenon in the world. This emerging network is supposed to be closely interdependent with the wire-based network. In this paper, after reviewing the Japanese regulatory scheme for mobile telecommunications, we investigate the interdependency by estimating both price elasticities and network effects among them. The own-price elasticities are relatively high, and the substitution, as well as the network, effect is substantial. Moreover, the resulting super-elasticities of mobile telephones are consistently larger than those of fixed-line telephones. These findings indicate that the Ramsey optimal price structure may have required a lower price–cost margin of mobile networks, relative to that of fixed-line networks. It should be noted, however, that the difference in super-elasticity between the two networks seems to have substantially diminished during our sample period. J. Japan. Int. Econ., December 1999, 13(4), pp. 311–335. Shinshu University, Nagano 390-8621, Japan and InfoCom Research Institute, Tokyo 107-0062, Japan. Copyright 1999 Academic Press.Journal of Economic Literature Classification Numbers: D12, L43, L96.