Is Nvidia Dominance in S&P 500 a Cause for Concern?

**Stock-Market Manias: A Growing Risk for Ordinary Investors

Stock-market manias have a ripple effect far beyond their epicenter, posing a significant risk to 401(k) and IRA investors. The current frenzy surrounding stocks like the soaring Nvidia serves as a prime example, but the threat extends to those opting for what they believe are safer bets, such as index funds like the SPDR S&P 500 ETF Trust (SPY).