Concentrated vs Diversified Portfolios — Buffett vs Bogle (Which Wins?)

In this video, we'll break down the century-old debate between concentrated investing and diversification, explain the mathematics behind both approaches, and help you determine which strategy actually fits your investing style. You'll learn: ✅ Why Warren Buffett believes concentration can outperform ✅ Why John Bogle believed most investors should simply buy the entire market ✅ The difference between having an investing "edge" and simply taking more risk ✅ The mathematics of diversification explained ✅ Why 15–20 stocks eliminate roughly 90% of company-specific risk ✅ Why adding hundreds of additional stocks provides surprisingly little extra diversification ✅ The lessons from Nortel and concentration risk ✅ How survivorship bias causes investors to overestimate concentrated investing ✅ What the SPIVA data says about active managers vs. index funds ✅ Why the Kelly Criterion argues against going "all in" ✅ The four questions every investor should answer before picking individual stocks ✅ Why a core-satellite portfolio may offer the best of both worlds