On a Wednesday that Wall Street had been watching for weeks, the Federal Reserve did what it has now done repeatedly in its most aggressive tightening cycle in decades: it raised its benchmark interest rate once more, sending a clear signal that policymakers are not prepared to declare victory over inflation until the data says otherwise. The decision was unanimous, and its message was blunt — the cost of money is going up. The mechanism is straightforward, even if its consequences are anything but. The Fed's benchmark rate is the rate at which commercial banks lend to one another overnight.

When that rate rises, banks pass the higher cost along to consumers. A car loan negotiated this month will carry a higher interest rate than one signed six months ago. A household that carries a balance on a credit card — and in the United States, tens of millions do — will find that balance growing faster, even if no new purchases are made. For borrowers already stretched thin, the compounding effect can be severe.

The logic behind the policy, however, is not simply punitive. Central banks in Europe, Latin America, and Asia have faced the same dilemma: raise rates aggressively and risk tipping the economy into recession, or move too slowly and allow inflation to become entrenched in wages and expectations. Brazil's central bank, for instance, began its own tightening cycle earlier than the Fed and has watched inflation prove stubbornly resistant even so. There is, as yet, no clean playbook for the moment the world finds itself in.