ECB Decision: Lagarde's September Test

The macro picture pulls in opposite directions. Brent crude is at $90 a barrel. Higher oil prices mean higher eurozone inflation and growing expectations of an ECB hike, which should support the euro. The same geopolitical instability that drives oil higher – the U.S.-Iran standoff over the Strait of Hormuz – also fuels safe-haven demand for the dollar. A recent heatwave in Europe and fertiliser shortages could push food prices higher, one reason Reuters-polled economists still expect a September hike even if oil stabilises.

A separate factor could support the euro. The ECB is considering doubling its minimum reserve requirement, a move that would drain roughly 160 billion to 170 billion euros of excess liquidity from the banking system. That would effectively tighten financial conditions without a rate change.

If Lagarde opens the door to a September move explicitly, the reaction may be only mildly bullish because the market has already built that in. If she strikes a cautious tone, the euro could give back recent gains more sharply. The asymmetry leans bearish for the euro, several traders said.

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