Wall Street's Biggest Bubble Looks Ready to Burst, and I Don't Mean AI or Quantum Computing

The article warns that a $1.5 trillion margin debt bubble poses a greater risk to the stock market than AI or quantum computing bubbles. Margin debt has surged 77% since April 2025, mirroring patterns that preceded the dot-com crash, financial crisis, and 2022 bear market. However, the author advises patient, long-term investors that historical data shows all 107 rolling 20-year S&P 500 periods since 1900 were profitable, suggesting market downturns present buying opportunities.