Cisco's stock took 25 years to reclaim its year-2000 peak, despite the underlying business growing significantly. This serves as a stark reminder that even a successful, growing company can deliver zero returns for decades if an investor buys in at an extremely high, bubble-era valuation.

Some companies execute a 3-5 year plan and then revert to average returns. Others 'win by winning'—their success creates new opportunities and network effects, turning them into decade-long compounders that investors often sell too early.

A key tension in modern investing is that the best businesses often appear perpetually expensive (e.g., 30x+ P/E). However, their ability to continue delivering double-digit returns challenges the core value investing principle of buying at a low multiple, demonstrating the immense power of long-term quality and compounding.

The "Nifty Fifty" stocks of the 1970s, including blue-chips like Disney and Coca-Cola, collapsed despite being great businesses. Their sky-high valuations offered no margin of safety, proving that quality alone cannot protect investors from paying bubble-like prices for future growth that may not materialize.

The typical 'buy and hold forever' strategy is riskier than perceived because the median lifespan of a public company is just a decade. This high corporate mortality rate, driven by M&A and failure, underscores the need for investors to regularly reassess holdings rather than assume longevity.

During the "Go-Go Years," even premier companies like Disney and McDonald's traded at over 70x earnings. While the businesses survived and thrived, investors who bought at these peaks faced years of poor returns, proving that a great company can be a terrible investment if the price is too high.

Contrary to the 'hold forever' value investing trope, a three-year period of underperformance is a strong signal that your initial thesis was flawed. It's better to admit the mistake and reallocate capital than to stubbornly wait for the market to agree with you.

Over 58 years, Warren Buffett made ~400 investment decisions, but only 12 truly mattered—a 4% hit rate. The crucial insight is not just buying right, but holding these few exceptional businesses for decades, allowing compounding to work its magic.

Even for the world's greatest investor, success is a game of outliers. Buffett made the vast majority of his returns on just 10 of 500 stocks. If you remove the top five deals from Berkshire's history, its returns fall to merely average, highlighting the power law effect in investing.