The Federal Reserve raised interest rates. And bond yields fell. That apparent contradiction is probably the most important message from Wednesday’s meeting. The Fed increased its policy rate by 25 basis points to 3.75–4%, its first increase since 2023. The decision was unanimous. Kevin Warsh made clear that inflation remained too high, that recent data had not shown sufficient improvement and that the Fed was prepared to tighten again. Most policymakers now expect at least one further increase before the end of the year. Yet on Thursday, the US 10-year yield slipped back below 5%, ending eight consecutive sessions of increases.

The Fed raised the price of money at the short end. And reduced the fear premium at the long end. That is what credibility looks like in a bond market. Before the meeting, investors were not simply worried about another 25 basis points. They were worried that the Fed was falling behind inflation. Oil above $100, persistent service inflation, resilient employment, enormous government borrowing and a new wave of corporate issuance had pushed the 10-year Treasury above 5% for the first time since 2007. The market was effectively asking whether Washington still had an institution prepared to say no. Warsh answered yes. The immediate result was a classic flattening of the yield curve. Two-year Treasury yields, closely linked to expectations for Fed policy, moved toward 4.74%. Longer yields performed better. That distinction matters. The market is no longer primarily demanding compensation because it doubts the Fed’s willingness to fight inflation. It is increasingly pricing the economic consequences of the Fed actually doing it. This is a very different risk.

For months, investors feared that political pressure for lower interest rates could weaken monetary credibility. President Donald Trump has continued to argue publicly for substantially lower rates, while Warsh has now moved in the opposite direction. Wednesday’s unanimous decision therefore reinforced the perception that monetary policy remains focused on inflation despite that pressure. The irony is difficult to miss. The administration wants lower long-term borrowing costs. Warsh may have discovered that the quickest way to achieve them is to raise short-term rates. Not because tighter monetary policy mechanically lowers Treasury yields. It does not. But because investors will accept a lower long-term inflation premium when they believe the central bank is prepared to act. That is exactly what July failed to deliver. When the Fed held rates, and Warsh remained ambiguous about how he intended to respond to inflation, long yields rose. This time he removed the ambiguity. The market listened. But this is not yet a victory.

The Fed’s own projections suggest another increase this year. Markets are more aggressive, pricing substantially more tightening into 2027 than policymakers themselves currently indicate. Reuters reported that investors moved towards pricing three further increases by the middle of next year after the meeting. That gap will matter. If inflation moderates, Warsh may have achieved something valuable: a relatively small amount of additional tightening could restore credibility without requiring a much larger increase in long-term borrowing costs. If inflation does not moderate, the story changes completely. Then the market will discover that Wednesday was not a credibility adjustment. It was the beginning of another tightening cycle. That would be considerably more uncomfortable for equities. A 4% policy rate is manageable. A sustained move toward 4.5% or beyond, while the 10-year remains around 5%, changes the hurdle rate for almost every investment decision.

The dollar strengthened after the Fed meeting as investors repriced the US rate path. Meanwhile, the Bank of Japan is expected to raise its policy rate from 1% to 1.25% on Friday, continuing a global shift away from the assumption that monetary policy would steadily ease. This is perhaps the larger message. The great rate-cut cycle investors expected is disappearing. The ECB has already tightened. The Fed has now joined it. Japan is likely next. Central banks are discovering that energy shocks, fiscal expansion and resilient demand do not coexist comfortably with cheap money. Wednesday therefore mattered for much more than 25 basis points. Warsh demonstrated something the Treasury market had begun to doubt: the Fed is prepared to tolerate higher short-term rates to prevent inflation from becoming embedded. For the moment, investors have rewarded him. But credibility is unusual capital. It takes months to accumulate. And one inflation report to spend. The Fed raised rates on Wednesday. The remarkable part is that, for the first time in months, the bond market found that reassuring.