This paper demonstrates that vertical divestiture may increase consumer welfare even when the divestiture eliminates substantial scope economies and precludes only limited sabotage. More generally, the merits of vertical divestiture are shown to vary with: (1) the type and the intensity of...

This paper explains why conclusions that appear to be “facts” can truly be “myths” in industries like today’s telecommunications industry, where key suppliers operate in multiple vertical stages of production. The paper explains, for example, why an entrant’s decision to make or buy...