This comprehensive presentation challenges the common assumption that investing exclusively in U.S. equities through the S&P 500 is the optimal choice, instead advocating for a globally diversified approach using ETFs like MSCI ACWI. While acknowledging that U.S. stocks have delivered superior returns (10.48% CAGR vs. 8.95% for developed markets) over the past 100 years and currently represent 60%+ of global market capitalization, we emphasizes that historical dominance is no guarantee of future performance—citing Japan's decline from 30% to 5% of global market cap as a cautionary tale.

The core argument centers on portfolio survival rather than maximization: a globally diversified portfolio naturally maintains significant U.S. exposure while hedging against the concentration risk of being fully invested in a single country. For passive investors seeking simplicity and peace of mind, the recommendation is to hold a market-cap-weighted global index like MSCI ACWI or FTSE All-World, which provides both the growth potential of U.S. markets and protection across multiple geographic regions. The key insight is that diversification doesn't mean abandoning conviction in high-performing markets—it means owning the entire market structure rather than betting everything on one horse.

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