Access pricing and market structure

In telecommunications industries access charge problems are important issue s during deregulation. In Japan and the US, deregulation also involves the issue of industrial structures as integration or divestiture of a long-dist ance sector. This paper analyzes access charge problems by introducing effe cts of the divestiture on cost functions. We show how the effects influence economic welfare under the integration and the divestiture in the Stackelb erg model. The main result is that, without regulation, welfare losses, cau sed by an effect of double marginalization in the divestiture case, are not crucial when an entrant and a divested long-distance firm can make use of an efficient cost function. We also obtain a relationship between Ramsey ac cess charges and the Efficient Component pricing Rule. (C) 2001 Elsevier Sc ience B.V. All rights reserved.