The Federal Reserve left its policy rate unchanged at a target range of 3.5 to 3.75 percent. The decision itself was expected. What was not is that three regional bank presidents, Beth Hammack of Cleveland, Neel Kashkari of Minneapolis and Lorie Logan of Dallas, dissented in favour of raising by a quarter point.

Three dissents pointing the same way is rare. The last time that happened the world was a decade younger, and it matters because dissent inside the committee is the earliest public signal of where policy is heading. One dissenter is a view. Three, aligned, is a bloc, and it puts the chair in the position of holding a line rather than expressing a consensus.

The reason is inflation that has now run above the 2 percent target for more than five years. Analysts have pointed at two sources that monetary policy handles badly: tariffs, which raise import prices as a matter of law rather than demand, and energy costs driven by the conflict in the Middle East. Neither responds to a rate rise in the way domestic overheating does, which is the argument the majority is making for waiting.

For European readers the transmission is indirect but real. A Fed that is nearer to raising than cutting supports the dollar, tightens global financial conditions, and narrows the room the European Central Bank has to move on its own timetable. It also puts a floor under the borrowing costs that price French sovereign debt, at a moment when the spread on that debt is already carrying a political argument.