Reformers are correct to emphasize that regulatory reform accompany privatization, as privatization without regulation reform may be costly to consumers. Wallsten explores the effects of privatization, competition, and regulation on telecommunications performance in 30 African and Latin American countries from 1984 through 1997. Competition is associated with tangible benefits in terms of mainline penetration, number of pay phones, connection capacity, and reduced prices. Privatizing an incumbent is negatively correlated with mainline penetration and connection capacity. Privatization combined with regulation by an independent regulator, however, is positively correlated with connection capacity and substantially mitigates privatization's negative correlation with mainline penetration.
Reformers are right to emphasize a combination of privatization, competition, and regulation.
In addition, researchers must deal with endogeneity of privatization, competition, and regulation to deal with issues of causality. The full report is available in PDF format.