Wall Street is betting Trump backs down on Iran — but what if the ‘TACO’ trade fails this time?

MarketWatch· Isabel Wang· Sep 17, 2026 · 9:09 PM

For six months, investors had a playbook: when Trump threatens Iran, buy the dip, because he always backs down. But in September, the playbook stopped working.

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Wall Street is betting Trump backs down on Iran — but what if the ‘TACO’ trade fails this time?

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