以下是chatgpt 说的，也跟我自己及其许多做这个专业的同事朋友熟人的分析吻合：

Market Return Trends (Proxy for QQQ)

Stocks (S&P 500) have tended to perform better on average during Democratic presidencies compared with Republican ones. Several analyses show:

• Across many decades, average annual returns were higher under Democratic presidents (~10 %+) than under Republicans (~6–7 %).

• Long-term studies show median annual returns are also often higher under Democrats.

Some data even suggest that QQQ-like tech returns have tended to be especially strong under administrations that coincided with technological growth cycles, many of which occurred during or overlapping Democratic presidencies (e.g., Clinton, Obama, Biden).