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.

GE serves two distinct customers: powerful airframers for the initial sale and a fragmented base of hundreds of airlines for aftermarket services. This split forces new entrants to solve a '3D puzzle' of satisfying both technically demanding OEMs and a global user base simultaneously, creating an immense and durable barrier to entry.

Drawing on Seth Godin's concept, Gardner posits that the best companies build such profound, unfair advantages (brand loyalty, scale, network effects) that it's almost like they're "cheating." As an investor, your job is to find and own these "cheaters."

For communities or companies like Dave Gerhardt's Exit 5, the founder's personal brand can become the primary differentiator. This creates a 'category of one' in the customer's mind (e.g., 'The Dave Gerhardt Community'), making direct comparisons difficult and establishing a powerful moat that transcends feature-based competition.

Stocks with the strongest fundamentals (top dog, sustainable advantage, great management) are often labeled "overvalued" by commentators. Gardner argues this perception is actually the ultimate buy signal, as the market consistently underestimates the long-term potential of true greatness.

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 most effective investment strategy is to first identify a growing consumer category with strong tailwinds (e.g., Mediterranean food). Only then should you invest in or build the company with the potential to become the dominant player, capitalizing on the winner-take-all dynamics of the industry.

Top compounders intentionally target and dominate small, slow-growing niche markets. These markets are unattractive to large private equity firms, allowing the compounder to build a durable competitive advantage and pricing power with little interference from deep-pocketed rivals.

Sustainable scale isn't just about a better product; it's about defensibility. The three key moats are brand (a trusted reputation that makes you the default choice), network (leveraged relationships for partnerships and talent), and data (an information advantage that competitors can't easily replicate).