流动性和通胀是美股波动的核心

Group 1 - The core conclusion indicates that since November, the US stock market has continued to weaken, with increased volatility in the A-share market. The main reasons for the recent volatility in the US market include a cooling expectation of interest rate cuts in December, a decline in market risk appetite, and significant concerns regarding the degree of AI bubble. The S&P 500's price-to-earnings (P/E) ratio is at a high level, approaching the peak during the dot-com bubble, while the Nasdaq index's P/E ratio is also high but still has a considerable distance from the dot-com bubble peak [2][8][9] - The financial pressure on major US tech companies is rapidly increasing, with some financial pressure indicators nearing levels seen during the dot-com bubble. The capital expenditure to revenue ratio for the seven major US tech companies has risen to 19% as of Q3 2025, compared to a peak of 10% during the dot-com bubble. Additionally, the capital expenditure to free cash flow ratio has exceeded 100%, indicating significant financial strain [3][16][20] - The report emphasizes that the core factors influencing the magnitude and duration of overseas market volatility are liquidity and inflation, rather than earnings. Historical examples show that liquidity tightening due to interest rate hikes has led to valuation corrections in high-valuation sectors. The most critical factor for the sustainability of a slow bull market in the US is persistent low inflation [3][23][28] Group 2 - The report suggests that the current valuation levels of the US stock market indicate a bubble-like state, with the S&P 500's P/E ratio exceeding the average by more than one standard deviation since 2000. The peak P/E ratio was approximately 29.8 times at the end of October, close to the 30 times peak during the dot-com bubble [11][12][14] - The report also notes that the potential for the Federal Reserve to continue cutting interest rates in 2026 is higher, with a low probability of aggressive rate hikes leading to a valuation bubble burst. The ongoing strength of the US stock market since October 2022 is attributed more to easing inflation than to changes in earnings [28][29] - The report highlights tactical and strategic views on the market, indicating that while the foundation for a bull market remains solid, there may be wide fluctuations due to weak economic data and adjustments in overseas markets. There are opportunities for upward movement in the A-share market if there are positive policy or funding changes by the end of the year [29][34]