Contrary to typical risk-off behavior, a financial shock originating in the US would likely be positive for the EUR/USD exchange rate. This is because it creates more room for the US Federal Reserve to reprice its policy downwards and can trigger repatriation flows out of US equities.

Investors have been holding unhedged US dollar assets to capture both high yields and currency appreciation, a speculative strategy traditionally used for emerging market local currency bonds. This parallel indicates a shift in risk perception, where US assets are no longer seen as a pure safe haven.

Despite an equity rotation story away from the US that should support a weaker dollar, the currency is overshooting. This discrepancy is attributed to geopolitical uncertainties related to Iran. Without this risk premium, the dollar would likely already be weaker, indicating underlying bearish pressure on the currency.

While a major sell-off in AI stocks would likely cause an initial "knee-jerk" strengthening of the US dollar due to risk aversion, the subsequent focus would shift to the US's twin deficits, leading to a multi-year dollar weakening trend once volatility subsides.

Contrary to the historical norm where volatility rises with a strengthening dollar (risk-off), the market is now experiencing higher volatility as the dollar falls. This unusual 'dollar down, vol up' dynamic suggests a pro-cyclical market backdrop and has major ramifications for how FX options and risk reversals are priced.

The U.S. dollar's decline is forecast to persist into H1 2026, driven by more than just policy shifts. As U.S. interest rate advantages narrow relative to the rest of the world, hedging costs for foreign investors decrease. This provides a greater incentive for investors to hedge their currency exposure, leading to increased dollar selling.

The classic "stocks down, dollar up" correlation is weakening. A J.P. Morgan model shows that relative US equity underperformance (dollar-negative) is currently offsetting the effect of an outright global equity decline (dollar-positive). This dynamic leads to only modest moves in the dollar despite stock market stress.

Unlike the 2008 crisis, which was localized in housing and banking, the current problem is with the US dollar itself. Global central banks are now fleeing the dollar for assets like gold, signaling a systemic crisis, not a sectoral one.

Historical precedent suggests that in a positive growth environment, a geopolitical shock like a potential US-Iran conflict might not lead to a sustained risk-off rally in the US dollar. Markets may price out the risk premium quickly, allowing pro-cyclical trends to resume, as seen in a similar event last year.