In this paper we present a history-friendly model of the changing vertical scope of computer firms during the evolution of the computer and semiconductor industries. The model is history friendly, in that it attempts at replicating some basic, stylized qualitative features of the evolution of...

Innovation and industrial evolution -- History-friendly models: methods and fundamentals -- The US computer industry and the dynamics of concentration -- Vertical integration and dis-integration in the computer industry -- The pharmaceutical industry and the role of demand -- Reprise and conclusions