Most central bankers want to give markets a clear signal. Martins Kazaks just gave investors a sharp one.
The ECB rate setter said the bank is ready to hike if oil keeps pushing inflation expectations higher, and that April's decision to hold rates was not the dovish move some traders read it as.
Kazaks pushed back on the idea that the ECB is willing to look past rising prices, saying April's hold was a pause and not a signal that the bank is comfortable with the path of inflation.
The reasoning is simple: the longer the Middle East shock lasts, the higher the odds that second-round effects show up in wages and prices.
That is the exact channel central bankers fear most, where short-term price spikes become long-term changes in how people and businesses set wages and contracts.
Stagflation is not the baseline at the ECB, but Kazaks made clear that inflation is likely to stay high for some time even if the conflict ends quickly.
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The ECB's March baseline put euro area inflation at 2.6% for 2026, but energy markets have already moved away from that baseline with severe scenarios pointing much higher.
Financial-market inflation expectations remain anchored for now, while consumer expectations have started to wobble - and that gap is what Kazaks is watching.
The ECB wage tracker is pointing to slower wage growth ahead, and underlying inflation indicators have been stable through the first part of 2026.
The catch: Both of those would normally argue for staying on hold, but the oil channel is the wild card that could force the bank to move.
Fiscal policy is another risk Kazaks flagged, since loose government spending across the euro area could add to inflation pressure on top of the energy shock.
The ECB meets again in June, and Kazaks said the bank will keep moving meeting by meeting based on the data in front of it.
Investors should read that as a hike being on the table, especially if oil holds at current levels or pushes higher into the summer.
The April hold bought the ECB time, and oil is deciding how much time it bought.
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