This document discusses competitive advantage in mature industries. It notes that in mature industries, opportunities for differentiation advantage have diminished as products become standardized and buyers are more knowledgeable. Cost advantages are also difficult to sustain as process technologies diffuse. However, the document argues that maturity does not preclude opportunities for competitive advantage and innovation. It outlines that in mature industries, competitive advantage is increasingly based on cost leadership rather than differentiation. Effective strategies focus on tightly controlling costs and increasing sales while maintaining product quality and customer service. The document uses McDonald's as an example of a company that achieves cost advantage through stringent control and monitoring of materials and processes.