The "Passive Bid" (automatic 401k flows into market-cap-weighted indices) creates a floor under the market. Even as individual AI/Software companies "blow up," the indices remain near all-time highs. Traditional short-selling logic is broken. In the past, bad fundamentals led to selling that fed on itself. Now, passive flows absorb the selling, preventing price discovery. Shorting the indices or high-valuation tech based on fundamentals is a "widow-maker" trade in this structure. WATCH / NEUTRAL. Fleckenstein explicitly states he closed his short fund because this dynamic makes managing risk impossible. Do not short the indices despite the "AI bubble" thesis. If unemployment spikes, passive 401k inflows would stop, potentially removing the floor and causing a rapid crash.