In a keynote speech, European Central Bank President Christine Lagarde assessed the economic implications of a major energy supply shock linked to the conflict affecting the Strait of Hormuz and set out what the ECB needs to observe before calibrating its monetary policy response. She highlighted two key uncertainties, the duration of the disruption and the extent to which higher energy prices pass through to broader inflation, while reaffirming that the ECB will act as needed to return inflation to 2% over the medium term. The ECB’s March baseline, adverse and severe scenarios all implied higher inflation and weaker growth than expected in December, with outcomes worsening as energy prices rise. Lagarde cited estimates of a net loss of around 13 million barrels of oil per day, roughly 13% of global consumption, before any additional impact from a US blockade, while noting that oil prices had not risen far enough to align clearly with the adverse scenario and that European gas prices were below baseline assumptions. She also flagged potential non-linear effects if disruption persists and shifts from higher prices to shortages and rationing, pointing to risks from reduced Gulf supply of helium, fertilisers transiting the Strait, and methanol production, alongside localised stress such as jet fuel prices roughly doubling and rationing at some airports since early April. On fiscal policy, the speech drew lessons from 2022 on the trade-offs between price-based measures and income-based support: broad tax cuts and price caps reduced inflation by close to 1 percentage point but can weaken incentives to cut energy use and mechanically lift inflation when unwound, while widely distributed transfers can sustain demand and intensify pass-through. Lagarde also referenced 2022 fiscal measures of 1.7% of GDP and warned that reduced fiscal space increases the need for support that is temporary, targeted and preserves the price signal. The ECB will monitor incoming evidence on firms’ pricing behaviour, wage negotiations and the evolution of the disruption before drawing firm conclusions on the appropriate monetary policy reaction.