The document discusses competitive rivalry and competitive dynamics between firms. It defines key terms like competitors, competitive rivalry, and competitive behavior. It presents a model of competitive rivalry that examines factors that influence the intensity of rivalry, like the number of competitors, market characteristics, and firms' strategies. It also discusses determinants of competitors like market commonality and resource similarity. The document outlines a framework for competitive analysis and describes strategic versus tactical competitive actions and responses. It examines the characteristics and risks/benefits of first movers, second movers, and late movers. Finally, it discusses competitive dynamics in slow-cycle, fast-cycle, and standard-cycle markets.