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

MarketWatch Thursday 17 September 2026, 21:09 UTC By Joseph Adinolfi 1 min read

Key Points

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.

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. [Image text:] 7.01.0 12.3-0.30 i. 1.5767 501.28+2.44477.31+0.49% 425.13-1.55 875.38+2.90A 391.15 410. 814.04-1.71% 819.87 9.34+0.56 940.82-0.817 92:A 123.6+0.8 489.51 A%h8T- 148.40-1.68% B6HA 111.67+2 249.19 .28-0.30/7167.70 40.69 0.56%7 21.94 76%

Trump (ORG) Iran (LOCATION)

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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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