The war between the United States and Iran has delivered an energy shock severe enough to upend the policy calculus of every major central bank simultaneously, arriving at a moment when global growth momentum was already fading.
Reuters and the New York Times both reported Wednesday that central bankers are sounding inflation alarms in public, with institutions across the G4 repricing their rate expectations in what Reuters described as a historic convergence of policy pressure. The energy shock, according to Axios, is getting worse rather than stabilising, offering policymakers little prospect of a near-term reprieve.
The dilemma is acute. Raising rates to suppress inflation risks compounding a growth slowdown already under way; holding or cutting to support activity risks letting energy-driven price pressures become entrenched in wages and services. Politico quoted policymakers describing the situation bluntly: "all bets are off."
The Reserve Bank of Australia became the first major central bank to act, hiking rates in direct response to the Iran war shock, according to Bloomberg. Whether other G4 institutions follow, or instead tolerate a temporary inflation overshoot while monitoring growth, is the central question now confronting markets.
For European institutions the pressure is compounded. European markets are disproportionately exposed to Middle East energy supply routes, and MarketWatch noted that the conflict is becoming a particular nightmare for the region's asset prices and monetary authorities alike.
Rate futures across G4 markets have repriced materially, according to Reuters, reflecting the market's judgment that the stagflationary risk is real and that central bank optionality has narrowed sharply.

