Part 3/8:
The top 10 stocks within the S&P 500 have elevated their total market capitalization to an astounding $20 trillion, which closely aligns with the U.S. GDP of around $27-28 trillion. This represents a staggering concentration of wealth within just a handful of companies, notably Apple, which alone constitutes around 8% of the total S&P 500 market cap. With Apple's current valuation at nearly ten times its sales—its highest in history—there are significant implications for market stability, raising fears of an impending blowoff top in the stock market.