Nasdaq Composite

The Nasdaq Composite appears in EP57 美股动荡，东升西降？这回是走是留 as the tech-heavy U.S. index whose technical break and mega-cap dependence anchor much of the episode’s caution. 大雄 notes that the Nasdaq had broken below its 200-day moving average and that short-term moving averages were turning weaker, making aggressive bottom-fishing unattractive.

So are we in an AI bubble? Here are clues to look for. adds the dot-com comparison. The Planet Money episode says the Nasdaq’s post-2000 collapse shows how a technology bubble can damage investors and help push the economy into recession, while still leaving some later-useful infrastructure behind.

Source Position

• The Nasdaq is used as the public-market expression of AI and mega-cap technology enthusiasm.
• The source links Nasdaq risk to Mega-Cap Concentration Risk, AI Equity Valuation Risk, and Index Reentry Discipline.
• In the Q&A, the speakers warn that the relationship between the Nasdaq and Hang Seng Tech Index is not a mechanical seesaw; both can fall together during liquidity stress.
• The Planet Money AI-bubble source uses the Nasdaq as the historical crash benchmark for thinking about AI-market downside.

Connections

• S&P 500 — broader U.S. benchmark used for valuation and ordinary index investing.
• Hang Seng Tech Index — Hong Kong technology index discussed through changing correlation with U.S. tech.
• Passive Investing and Investment Risk Management — ordinary-investor implementation frames.
• Productive Bubble Spillovers, Technology Installation Cycle, and AI Equity Valuation Risk — dot-com comparison added by Planet Money.