When change occurs, most people focus on the main effects—the spurts in growth of new types of products and the falling demand for others. You must dig beneath this surface reality to understand the forces underlying the main effect and develop a point of view about the second-order and derivative changes that have been set into motion. For example, when television appeared in the 1950s it was clear that everyone would eventually have one and that “free” TV entertainment would provide strong competition to motion pictures. A more subtle effect arose because the movie industry could no longer
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