Exactly 20 years ago, Michael Porter, the mighty lord of business strategy, wrote an article in Harvard Business Review to discuss the simplest question: “What is strategy?” What he put forward were six fundamental principles that form the foundations of business strategy, later reinforced in a 2001 article dedicated to “Strategy and the Internet”.

Today, the strategic implications of software eating the world are easier to figure out — including for Porter himself. As the digital economy has become more visible and tech companies now dominate the global economy, we have a better grasp of how competing firms, both tech and non-tech, can apply the Porterian strategic positioning framework and build a competitive advantage that will be sustainable even on digital markets…