A major policy goal of the Motor Carrier Act of 1980 was to provide the shipping public with more efficient truck freight rates. Unlike previous studies, which have focused on intrastate reforms or highly aggregated data, this article analyzes dynamically the effects of the act on the freight...

We attempt to overcome the serious data problems of past telecommunications cost studies by focusing on local exchange carriers (LECs). With enough degrees of freedom to yield precise estimates, our global subadditivity tests show that the cost function is definitely not subadditive. The results...