Applied Industrial Organization offers a perspective on the richness of empirical industrial organization studies. Some papers derive empirical implications from theoretical models, but other papers start from empirical evidence and construct a theory. Three major topics are explored: the role of innovation, the evolution of market structure and firms, and the determinations of performance. As the central force of market economies, innovation is the essence of competition and results in changes to market structures. Other forces driving the evolution of markets and firms are also...