According to CoinMeta, a study by Bank of America indicates that the current U.S. stock market exhibits characteristics similar to those of the late 1999 internet bubble period, with a high concentration in the S&P 500 and funds continuously chasing a few top-performing stocks. NVIDIA has teamed up with Wall Street giants to plan a $500 billion infrastructure financing deal, which has raised concerns about the alignment between capital expenditure and performance returns. Bank of America believes that when chip manufacturers, cloud providers, and large technology companies become the core drivers of index gains, the apparent prosperity of the market masks internal vulnerabilities. If revenue returns from these companies fall behind the expansion of capital expenditure, index volatility is likely to increase.