The document discusses the evolution and impact of management consulting, particularly the development of the strategy concept in American business since the 1960s. It highlights how early consultants transformed business practices by introducing analytical tools and methods that focused on competition, supply chain management, and market analysis, leading to the establishment of management consulting as a lucrative industry worth $250 billion today. While the traditional functions of consulting are facing disruption from technological advancements and increased data accessibility, consulting firms continue to evolve by leveraging expertise and adapting to new challenges.