Many investors focus on the current size of a company's competitive advantage. A better indicator of future success is the direction of that moat—is it growing or shrinking? Focusing on the trajectory helps avoid value traps like Nokia in 2007, which had a wide but deteriorating moat.

In the AI era, traditional moats weaken. Ultimate defensibility comes from a deep, proprietary understanding of a core market signal. The company becomes an intelligent system that uses AI to rapidly iterate on and improve this unique "world model," creating a moat of insight.

The moat for a market leader isn't just the initial VC investment; it's the subsequent, rapid follow-on rounds that create a 'wall of money.' This forces competitors to prove they can win against not just a brand name, but also a massive and compounding capital advantage.

While many investors look for a competitive "moat," investor Mala Gaonkar's primary differentiator is identifying businesses with very long-duration moats. The key to finding truly great companies is assessing how long their competitive advantage can be sustained, not just that it exists today.

With traditional moats gone, the only way to stay ahead is to move faster. Defensibility now comes from the speed at which a team can ship new value and deeply understand its customers, ensuring the product is always one step ahead of a crowded field.

A sustainable competitive advantage is often rooted in a company's culture. When core values are directly aligned with what gives a company its market edge (e.g., Costco's employee focus driving superior retail service), the moat becomes incredibly difficult for competitors to replicate.

The fluid nature of AI means traditional moats are unreliable. Defensibility is no longer a static plan but a daily practice of innovation and execution. Even established public companies feel threatened, proving that staying ahead requires constant movement and earning your position every day.

The idea that "moats are dead" is a misinterpretation of a changing landscape. While a specific product feature might no longer be defensible, durable moats are re-emerging in other areas like proprietary data, unique distribution channels, or deeply ingrained platform ecosystems.

As AI commoditizes business execution, true defensibility will come from creative ingenuity in areas like go-to-market strategy or novel business models. This form of creativity cannot be generated by AI, making it a rare and durable competitive advantage.