Why Warren Buffett Chose This 2-Fund Portfolio For His Spouse?

Warren Buffett's 90/10 portfolio - 90% in S&P 500, 10% in short-term government bonds - offers simplicity, low cost, and historically strong performance. The S&P 500's dominance is justified by its profitability, global revenue exposure, and long-term outperformance of most active funds, though it lacks small-cap and international diversification. Buffett's aggressive equity allocation suits his wife's likely large inheritance and goals, but may not be suitable for retirees with smaller nest eggs due to sequence of returns risk.