Intense rivalry between incumbents is a threat that? Solution The Intensity of Rivalry between Incumbents is a threat that reduces the profits of existing enterprises. The Perfect example is Airline Industry. If this rivalry between Incumbents is reduced somehow and the prices are allowed to be raised, the firms can earn profits. The major factors which determine the rivalry between firms are: - Type of the product - Demand and Supply of the product - Cost Structure of the firm - Competitive Environment in the industry If the firms have greater rivalry due to any these factors, their profits are bound to suffer..