Kevin Warsh is stepping into the Federal Reserve at a moment when voters are still angry about the cost of living and markets are watching for a clear plan on inflation. The new Fed chairman has said he wants to bring inflation back to the central bank’s 2% target, but the challenge is bigger than setting interest-rate policy.

The headline point is that the Fed cannot directly fix every source of higher prices. If energy costs jump because of tensions affecting the Strait of Hormuz, for example, monetary policy cannot reopen a shipping route or quickly undo a supply shock. That leaves Warsh facing the same basic limit every Fed leader confronts when inflation is being driven by forces outside domestic demand.

The central bank can influence borrowing costs, credit conditions and spending across the economy. Those tools may help cool demand and prevent price increases from spreading more broadly. But they are less effective when households are being hit by higher fuel and transport costs that come from global events rather than overheating at home.

That is why pressure on the Fed is rising again even as its room to maneuver may be constrained. Investors may want reassurance that Warsh is serious about restoring price stability, while consumers want relief they can feel in everyday expenses. The problem, as the debate suggests, is that some inflation risks sit well beyond the Fed’s control.