Business competition used to be a lot like traditional theater: On stage, the actors had clearly defined roles, and the customers paid for their tickets, sat back, and watched passively. In business, companies, distributors, and suppliers understood and adhered to their well-defined roles in a corporate relationship. Now the scene has changed, and business competition seems more like the experimental theater of the 1960s and 1970s; everyone and anyone can be part of the action.

A version of this article appeared in the January–February 2000 issue of Harvard Business Review.