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The building where the trading floor was, they never took it down even in the long gaps between seasons.

The Vix Volatility Index, a measure of investor expectations for market swings over the next 30 days — known across trading floors as Wall Street’s “fear gauge” — was elevated.

Roughly sixty miles away in the city of Yushu, it’s barely 8 a.m. in the cordyceps market, but already it has the frenetic energy of a stock market trading floor.

On trading floors that Tuesday, the scramble for short-term funds became a stampede.

For years, the whispered questions have passed from one Wall Street trading floor to the next.