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

For roughly six months, markets operated on a consistent pattern: when tensions with Iran escalated, equities dipped, and buyers stepped in on the assumption that threats would ultimately de-escalate. That assumption had been rewarded repeatedly, reinforcing the idea that geopolitical risk premiums were temporary rather than durable.

September disrupted that pattern. When the usual dip-buying response failed to produce the expected rebound, it suggested that investors were no longer treating every escalation as a guaranteed buying opportunity. In other words, the market's confidence in a predictable "back down" outcome may be weakening.

For observers, the key question is whether this reflects a lasting repricing of geopolitical risk or simply a pause in a familiar cycle. Watch how equities, oil, and safe-haven assets respond to the next round of headlines — and whether volatility stays elevated. If markets stop assuming de-escalation, the cost of hedging that risk could rise across portfolios.