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Este es el segundo volumen. In the first volume they authors provide an economic review of and commentary on these changes (These include technology changes -especially the effects of digitalization; introduction of new products including internet-based services, and convergence associated with the coming together of the broadcasting, information technology and telecommunications industries. Simultaneously, market structure has changed through the replacement of the former monopolistic, vertically integrated telephone companies by a variety of competing firms. These developments have been accompanied by major legislative and regulatory developments, including the passage in the United States of hte 1996 Telecommunications Act and the introduction of a large number of new laws and regulations in Europe and elsewhere. The same changes have seen a massive expansion of independent regulatory agencies. The major role has been to determine the terms of competitive interactions between the existing incumbent operators and new entrants.) in the landscape of what is arguably a very major industry. It attempts to provide a comprehensive account of the major applications of economic analysis to our field of interest, which is essentially two-way communications between parties that are not in physical contact with each other by means of fixed line telephony, mobile telephony, satellite telephony, cable TV telephony and Internet telephony. To a significant extent, voice communication is the process of interest.