Contrary to popular belief, earnings growth has a very low correlation with decadal stock returns. The primary driver is the change in the valuation multiple (e.g., P/E ratio expansion or contraction). The correlation between 10-year real returns and 10-year valuation changes is a staggering 0.9, while it is tiny for earnings growth.

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 case of Netflix in 2016, with a P/E over 300, shows that high multiples can reflect a company strategically sacrificing short-term profits for global expansion. Instead of dismissing such stocks as expensive, investors should use second-order thinking to ask *why* the market is pricing in such high growth.

Counter to conventional value investing wisdom, a low Price-to-Earnings (P/E) ratio is often a "value trap" that exists for a valid, negative reason. A high P/E, conversely, is a more reliable indicator that a stock may be overvalued and worth selling. This suggests avoiding cheap stocks is more important than simply finding them.

Shelby Davis's core strategy involved buying stocks where earnings would increase and, in parallel, the market would re-rate the stock with a higher P/E multiple. This dual effect created exponential returns far beyond what earnings growth alone could provide, turning a good investment into a multi-bagger.

Investment gains often come from "multiple expansion," where the market's perception of a business improves, causing it to trade at a higher valuation. This sentiment shift is frequently more impactful than pure earnings growth, and underestimating it is a primary reason for selling winning stocks too early.

With so much flux from AI, betting on undervalued "bargains" is a losing game. The smarter play is to be a momentum investor, buying stocks that are already winning. Their success creates a flywheel of talent and opportunity that is more predictive of future success than traditional valuation metrics.

Contrary to the belief that a low P-E ratio is always better, a high ratio can signify a 'growth stock.' This indicates investors are willing to pay more because the company is reinvesting its earnings into future growth, betting on higher profitability over time.

High-quality stocks are often expensive, meaning they trade at a high multiple of their earnings. In uncertain times, these multiples can shrink even if the company remains strong, leading to negative returns. Conversely, cheap, low-quality stocks have room for their multiples to expand, delivering positive returns.