The benefits of competition among the long-distance interexchange carriers (IXCs) are not realized equally by all their customers. Despite the declines in rates under the discount plans, we document that basic message toll service (MTS) rates have been rising for several years. We show that...

"Since the advent of heteroskedasticity-robust standard errors, several papers have proposed adjustments to the original White formulation. We replicate earlier findings that each of these adjusted estimators performs quite poorly in finite samples. We propose a class of alternative...