中美股票市场差异，真有那么大？

Group 1 - The core viewpoint of the article discusses the performance comparison between A-shares and U.S. stocks, indicating that A-shares may not underperform U.S. stocks as commonly perceived [4][6]. - From 2005 to December 5, 2025, the S&P 500 and CSI 300 indices increased by 748.25% and 574.74% respectively, translating to annualized returns of 10.72% and 9.52%, showing that the performance gap is not as significant as believed [7][9]. - The overall growth rate of A-share listed companies from 2005 to present is higher than that of U.S. stocks when excluding valuation changes [11]. Group 2 - The industry distribution of listed companies in both markets is gradually converging, with A-shares showing increasing exposure to technology sectors [12][18]. - The combined weight of Information Technology and Communication Services in the CSI 300 is 22%, while in the broader Chinese equity market, it reaches 30.2%, indicating a shift towards technology [16][18]. - The industry distribution in the Chinese market has evolved significantly since 2011, reflecting the rapid transformation of the Chinese economy [18]. Group 3 - The volatility of A-shares is notably higher than that of U.S. stocks, which affects investor behavior and overall investment experience [21][22]. - To improve the investment experience in A-shares, reducing market volatility is deemed essential, rather than solely focusing on enhancing the fundamentals of listed companies [23][24]. - Recent regulatory measures aim to lower the volatility of A-shares, indicating a potential for improved investor experience in the future [25]. Group 4 - Overall, the long-term performance of A-shares is not significantly inferior to that of U.S. stocks, but the volatility in A-shares has historically led to varied investor experiences [27]. - The trend towards decreasing volatility in A-shares is expected to continue, potentially leading to better investment outcomes for broad market indices [27].