The trouble with value chains—which I unveiled Monday—is that they don’t stay the same forever. They are constantly changing. Disruption, right? Take filmed entertainment. In 1980, it was just movies and TV, with movies in theaters and TV on broadcast. But home entertainment, cable, digital and the internet have all disrupted those two models. Plus toys and merchandise are sold for all of it now at unconsidered levels back then. ... Read MorePorter’s Five Forces…Explained
