um, there are very real marginal costs in the primary revenue centers of Apple (hardware), Google (TAC: traffic acquisition cost), Netflix (bandwidth) and Amazo

um, there are very real marginal costs in the primary revenue centers of Apple (hardware), Google (TAC: traffic acquisition cost), Netflix (bandwidth) and Amazon (logistics). "Infinite" leverage is also a misnomer: Ford and GE enjoyed terrific leverage when they optimized giant-scale industrial processes (the assembly line and six sigma, respectively). Politicians and lawyers enjoy much greater leverage than software engineers, whose code requires much more "maintenance" (in practice) than laws and legal contracts. Economically speaking, Wall Street traders enjoy fabulous leverage, though arguably they're getting replaced by algorithms.