Rogoff Warns Markets Mispricing Dollar Crash Risk as Geopolitical Tail Scenarios Multiply
Harvard economist flags 20% overvaluation and 'naive' assumptions on Iran war duration as structural risks to USD strength and central bank policy divergence.
Kenneth Rogoff, former IMF chief economist, warned Tuesday that the US dollar remains at least 20% overvalued and that markets are underestimating the probability of a prolonged Middle East conflict that could force rapid currency adjustment and derail consensus forecasts for Federal Reserve rate cuts.
The call, delivered in a Bloomberg interview on April 15, challenges the post-conflict consensus that geopolitical upside for the Dollar has peaked following ceasefire negotiations between Iran and Israel. The DXY dollar index closed at 98.0476 on Tuesday, down 0.08% and well below the March safe-haven peak above 102, according to Trading Economics.
Rogoff’s thesis centers on structural mispricing of war-duration optionality. While most institutional forecasts place the DXY in the low-to-mid 90s by late 2026 once geopolitical risk fades, per Cambridge Currencies, he argues markets are ignoring the inflation and policy consequences of a sustained Strait of Hormuz disruption. Brent crude surged above $110 per barrel in mid-April amid the Iran conflict, which the IEA has described as the largest supply disruption in the history of the global oil market.
“Every previous episode where the dollar — or frankly any major currency — has been this overvalued, it tends to come down over, say, a five- or six-year period.”
— Kenneth Rogoff, Harvard University
Valuation Gap Widens as Reserve Status Erodes
Independent purchasing power parity analysis from ABN AMRO corroborates Rogoff’s overvaluation thesis, finding the dollar 40% overvalued versus the Japanese yen and 17% overvalued against the euro based on November 2025 OECD data. The dollar’s share of global foreign exchange reserves hit a 31-year low of approximately 57% in early 2026, down from 58.2% in January when BRICS nations increased internal local currency settlement from 35% to 50%.
The structural challenge is temporal: Rogoff argues that while near-term safe-haven flows initially supported the dollar during the February-April Iran escalation, prolonged conflict would sustain inflation and block Fed rate cuts, trapping the currency in a stagflation scenario. This dynamic would simultaneously erode reserve status through accelerated de-dollarization, as documented in China-Brazil trade shifts and ASEAN payment system development throughout early 2026.
Geopolitical Tail Risk Underpriced
Market pricing implies near-term resolution of the Iran conflict, with ceasefire negotiations underway and oil prices retreating from $120s. But Rogoff’s warning echoes analysis from Euronews in March, when Frederic Schneider, senior fellow at the Middle East Council on Global Affairs, cautioned that “markets are underestimating the risk of a prolonged war.” Schneider identified a worst-case stagflation scenario combining economic slump with interest rate hikes to curb inflation.
The Iran War has effectively closed the Strait of Hormuz since late February, disrupting not only oil flows but helium and fertilizer supply chains, according to the World Economic Forum. If Brent remains elevated through mid-2026, J.P. Morgan models a 0.6% annual GDP drag from commodity shock transmission, complicating the Federal Reserve’s ability to ease policy even as growth slows.
The dollar paradox centers on opposing forces: safe-haven demand during acute geopolitical stress versus structural erosion of reserve status and overvaluation mean reversion. Rogoff’s call positions the second force as dominant over a multi-year horizon, even if the first produces short-term volatility.
Policy Divergence Threatened
The consensus trade entering 2026 assumed Fed rate cuts beginning in Q2 would narrow US-eurozone yield spreads and mechanically weaken the dollar. But sustained oil-driven inflation from a protracted Iran conflict would delay or cancel those cuts, paradoxically supporting the dollar in the near term while accelerating reserve diversification and emerging market stress.
Rogoff’s Rice University lecture series in March framed this as a multipolar currency system transition, where episodic dollar strength during crises masks long-term erosion. The currency’s historical tendency to mean-revert after overvaluation episodes — typically over five to six years — suggests the adjustment could be back-loaded, with geopolitical shocks determining the timing rather than the direction.
- Rogoff places dollar overvaluation at 20%+, corroborated by independent PPP analysis showing 17-40% premiums versus major currencies
- Markets pricing near-term Iran ceasefire may be underestimating war-duration tail risk and cascading inflation effects
- Dollar reserve share at 31-year low of 57% as BRICS accelerate local currency settlement to 50%
- Stagflation scenario — prolonged oil shock blocking Fed cuts — could trigger rapid FX adjustment and EM stress
What to Watch
Near-term dollar direction hinges on ceasefire viability and oil price trajectory. If Brent retreats to $90s and Iran tensions fade, consensus forecasts placing DXY in low-to-mid 90s by Q4 2026 remain intact. But sustained Strait disruption through summer would validate Rogoff’s thesis by forcing the Fed to maintain restrictive policy even as growth slows, setting up a delayed but sharper adjustment once inflation subsides.
The structural overlay is reserve diversification momentum. January’s acceleration in BRICS local currency settlement and China-Brazil trade shifts suggest de-dollarization is no longer tail risk but base case, with geopolitical duration determining the pace. Rogoff’s call positions war probability and conflict timeline as the mispriced variable — not whether the dollar corrects, but when the market reprices that optionality.