Natural monopoly in Portuguese telecommunications

Maria Carmo Seabra

doi:10.1080/00036849300000057

Natural monopoly in Portuguese telecommunications

Maria Carmo Seabra

NOVA School of Business and Economics (NOVA SBE)

Research output: Contribution to journal › Article

2 Citations (Scopus)

Abstract

The purpose of this paper is to show an empirical test of subadditivity based on a sufficient condition - namely, transray convexity coupled with global economies of scale - which has not been commonly used in the literature. We use this sufficient condition to test the hypothesis of subadditivity of the cost function in the largest Portuguese Telecommunications firm, CTT, and find that the market for telecommunications services in Portugal was a natural monopoly in the period analysed.

Original language	English
Pages (from-to)	489-494
Number of pages	6
Journal	Applied Economics
Volume	25
Issue number	4
DOIs	https://doi.org/10.1080/00036849300000057
Publication status	Published - 1 Apr 1993

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Seabra, M. C. (1993). Natural monopoly in Portuguese telecommunications. Applied Economics, 25(4), 489-494. https://doi.org/10.1080/00036849300000057

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