This paper, written when Fisher was preparing for his testimony in Microsoft, discusses the circumstances in which monopoly "leveraging" makes sense as an anti-competitive act. Three cases are discussed and contrasted: The IBM case of the 1970's; the Computer Reservation System Cases of the...

Employing a general equilibrium framework, Blackorby and Murty [2007] prove that, with a monopoly and under one hundred percent profit taxation and uniform lump-sum transfers, the utility possibility sets of economies with unit and ad valorem taxes are identical. This welfare-equivalence is in...