By Abhi Chatterjee, chief investment strategist at Dynamic Planner
The Oracle at Delphi never lied. Apollo’s priestess, the Pythia, delivered her pronouncements in verse: oblique, layered, resistant to simple reading — but never false. Croesus of Lydia asked whether he should invade Persia. The oracle told him that if he did, a great empire would fall. He invaded. A great empire fell: his own. The oracle was not wrong. Croesus had simply mistaken the direction of the truth.
Credit spreads are the bond market’s oracle. They do not editorialise, grant interviews or publish forward guidance. They simply price the gap between what a borrower promises and what the market believes — and across 25 years of data, they have been wrong far less often than the official narratives they contradict. The question is never whether the spread is telling the truth. The question is whether you are reading it in the right direction.
In my last column, I argued the bond market has become the arena where the most consequential bets in finance are placed — that duration, spreads and geography now offer the kind of analytical edge that crowded equity markets cannot. Now, we examine the second lever more closely. Not spreads as a technical concept, but spreads as the most honest signal in a market saturated with managed communication.
When a government or corporation issues a bond, it makes a promise: repay principal, pay the coupon, honour the schedule. A BBB-rated corporate borrowing at 150 basis points over Treasuries is being charged more because thousands of institutions have independently concluded that its promise carries 150 basis points of incremental doubt.
A CEO can deliver a confident earnings call. A finance minister can project fiscal rectitude from a dispatch box. Neither can talk down a credit spread if the institutions pricing it have reached a different conclusion.
The chart above makes this visible across a quarter century. Three spread series — A-rated, BBB-rated, and BB-rated corporates — plotted against the US government yield. The hierarchy of risk is legible at a glance: BB trading wide, A trading tight, BBB occupying the middle ground.
The moments that demand attention are the spikes: 2001–2002, 2008–2009, 2015–2016 and 2020. Each represents a moment when the gap between the official narrative and the market’s verdict became too wide to sustain. In 2008, bank executives were still describing their institutions as well-capitalised as financial spreads screamed otherwise. In March 2020, the entire corporate spread stack dislocated within days, anticipating an economic shock policymakers were still describing as containable.
The starkest recent demonstration of spread as sovereign truth-teller was not in the corporate market at all. In September 2022, Kwasi Kwarteng announced an unfunded fiscal expansion. Equity markets wobbled. Sterling fell. But it was the Gilt market that delivered the definitive verdict.
The more consequential reading challenge today is at the right-hand edge of the chart — and it is a subtler one. All three spread series have compressed toward their lowest historical ranges. The naive interpretation is reassurance: corporate credit looks nearly as safe as government debt; the system is calm. But I think this is precisely Croesus’s error. The compression is real, but it is partly an artefact of a shifting benchmark.
See also: Dynamic Planner’s Chatterjee: A year in the market’s mood swings
US Treasury yields are back at pre-financial crisis levels. And those elevated yields are not purely a story about growth expectations or monetary policy. US interest costs crossed $970bn in FY2025, and the Congressional Budget Office projects they will reach $2.1trn by 2036.
The gross national debt broke $39trn in March 2026. When the world’s supposed risk-free rate begins accumulating its own fiscal risk premium, every spread quoted against it is measuring something different from what it measured a decade ago. Apple’s 2036 bond trading at just 20 basis points over the 10-year Treasury does not mean Apple has become safer. It means the Treasury has become less so.
The structural difference between the Truss episode and the US fiscal trajectory is not one of mechanism — it is one of speed. Gilts moved in days because the shock was acute, concentrated and domestically legible. The US fiscal trajectory is chronic. The oracle is speaking, but the verse is harder to read when the prophecy unfolds over years rather than days. That is precisely why the spread is more valuable, not less: it is pricing a repricing that official narratives have not yet incorporated.
One can argue that compressed corporate spreads reflect genuine fundamental strength: balance sheets in aggregate are in reasonable health, default rates remain low and the post-pandemic earnings recovery was real. I accept this partially. But the more unsettling parallel is 2005-07, when corporate spreads also compressed toward historical lows — and were also, in retrospect, a false signal of calm.
Then, the mechanism was the systematic mispricing of mortgage credit, packaged into instruments whose complexity obscured the underlying risk. The water pulled back from the shore. The spread compression looked like safety. Then 2008 arrived.
Today’s compression has a different source but a similar logic. The risk-free rate has itself been repriced upward, partly by fiscal risk premium. That repricing has not yet propagated fully into corporate borrowing costs. When it does — through refinancing cycles, through tighter lending conditions, through the mechanical transmission of higher sovereign yields into the cost of capital across the real economy — the wave will arrive.
Sherman McCoy, whose ghost I invoked last month, confused the scale of his market with the quality of his judgement. The oracle’s warning to Croesus was not imprecise, but the king lacked interpretive rigour. Both men heard what they expected, rather than what was said. The credit spread is still telling the truth. The question, as always, is which empire is falling.
