Investor certainty over a December rate cut, a confidence the Federal Reserve had itself so carefully stage-managed, has evaporated with theatrical brutality. US Treasuries endured their sharpest sell-off in nearly five months after Jerome Powell, in yet another of his increasingly predictable reversals, informed markets that a further cut this year was “not a foregone conclusion”. Sensible, perhaps. Necessary, probably. But costly, unquestionably. With key economic data missing thanks to a government shutdown that would embarrass a mid-ranking emerging democracy, the Fed now needs not only to keep an open mind but to appear to possess one. And the fact that investors were nearly unanimous in expecting the cut merely illustrates how ineptly the institution has communicated its intentions.

Reasonable observers can disagree on whether the recent easing was justified or whether more should follow. The labour market shows signs of cooling, unemployment risks are rising, and yet inflation remains obstinately above the hallowed 2 per cent. These forces tug monetary policy in opposite directions, and even with full data, the calibration would be delicate; without data, it borders on divination. In such a fog, uncertainty is not a flaw but an admission of reality. Excessive conviction about the rate path not only tempts investors into absurd mispricing; it corners the Fed itself, which despises surprising markets almost as much as it fears admitting misjudgement. That aversion likely helped produce last week’s cut: having allowed markets to treat it as guaranteed, Powell would have required biblical justification to reverse course.

Keynes supposedly said, “When the facts change, I change my mind.” The Fed, judging from its posture, treats this not as guidance but as a kind of optional self-help slogan. And when dissension finally emerged inside the FOMC, one voice demanding a larger cut, another opposing any cut at all, it was not the symptom of an institution in crisis but the rare sign of intellectual honesty. When the right choice is genuinely unclear, unanimity becomes mere choreography.

Yet the most uncomfortable truth hangs elsewhere. With US federal debt now swollen to a scale once reserved for war economies, the Fed is no longer adjusting monetary conditions; it is adjusting the Treasury’s survival probability. Every incremental 25 basis points in interest rates now adds roughly $100 billion per year to federal interest payments. A quarter-point tweak has become the equivalent of a new federal programme. Whoever claims monetary policy can be conducted in splendid isolation from fiscal reality is either deluded or auditioning for a comedy festival. Beneath Powell’s caution lies not only macroeconomic uncertainty, but the arithmetic of empire: America cannot afford expensive money.

All this unfolds just as President Donald Trump announces his preferred candidate to lead the Fed, a role for which he expects, if not requires, enthusiastic support for serial rate cuts. Treasury Secretary Scott Bessent says the announcement may come before Christmas, adding a festive layer of instability to the bond market. Among the finalists are Governors Christopher Waller and Michelle Bowman, former Governor Kevin Warsh, and BlackRock’s Rick Rieder. Trump also keeps attempting to recruit Bessent himself, who continues to reject the idea with the polite determination of a man declining a Christmas pudding laced with arsenic.

Whoever ultimately takes the chair will need Senate confirmation and, if coming from outside, will embark on a new term just as Powell’s tenure ends in May. Whether the White House wants a central bank or a West Wing mood-management unit will soon become clear. Until then, prudence remains the only rational stance — for policymakers, for investors, and for anyone still pretending that the Federal Reserve is navigating rather than reacting.