Opinion: DeepSeek panic shows the S&P 500 isn’t the safe investment people think - MarketWatch
1. S&P 500 declined 2%, Nasdaq fell 3%. Long-term, these drops may seem trivial. 2. Concentration in seven stocks represents one-third of the S&P 500. This poses diversification risks for investors. 3. Nvidia and Apple account for 7% of the S&P 500 each. This skew raises concerns about market efficiency. 4. Equal-weighted indexing has historically outperformed traditional indexing. It provides better diversification and risk management.