The article compares different theories about competitive advantage in business. It looks at how different experts define and use the term. The main focus is on understanding what competitive advantage means and how it can be sustained over time. The authors discuss two main ways to manage competitive advantage: creating it and protecting it. They also talk about tools like the value chain and economic moats that can help with this. Overall, the article shows that different experts have different ideas about competitive advantage, but they all agree it's important for success in business.