Markets stop panicking when policymakers start.

I don’t know if the news out of Japan on Tuesday constituted “panic” exactly, but reports that the finance ministry sounded out market participants on recent developments at the long-end of the JGB curve are indicative of angst.

As most readers are probably aware, long-maturity Japanese bonds suffered an especially aggressive selloff this month amid an escalating global bear steepener. Some see a reckoning in the price action — a harbinger of the fiscal apocalypse.

I’m not hoarding doomsday supplies myself, but as discussed here over the weekend, this time does feel different, at least a little bit. There’s a palpable sense of quasi-existential concern.

It’s not so much any specific level of debt as it is the perception that for whatever reason — debt, deficits, the emergence of an ostensible alternative in Bitcoin, the increasingly naked nature of the underlying Ponzi dynamics, etc. — our money myths are becoming too implausible to take seriously.

To the extent that’s true, it’s pretty rich coming from human beings, a notoriously superstitious, lamentably credulous bunch. Notwithstanding conservatives’ angry contention that Western society’s become too secular (which, I should note, isn’t always consistent with the aspersions that crowd casts at devout Muslims), a lot us still believe wholeheartedly in some version of objectively ridiculous fairly tales about divinities, creationism, the afterlife and so on.

The juxtaposition’s hilarious. We go on Sundays to be regaled with stories about a magic wizard who walked on water, stories we don’t question lest we should be condemned to spend eternity enslaved by a pitchfork-wielding, horned demon, and then we turn around on Monday and argue that the veracity of our money myths hinges on debt and deficit levels. As if it’s somehow less plausible to suggest a heavily-indebted country can issue sound money than it is to insist the historical Jesus turned water into wine. (Incidentally, if he really did do that, he would’ve been history’s greatest drinking buddy. “Just water for us, thanks! My friend here will take care of the rest.”)

Spoiler alert: The money’s worthless. All of it. Dollars, yen, euros. Completely worthless. And it’s not more or less worthless depending on a nation’s debt profile, or whether a country balances its budget and so on. It’s just “pieces of paper with pictures on it so we don’t have to kill each other just to get something to eat,” to employ the by-now-clichéd Jeremy Irons monologue from Margin Call.

Here’s the thing, though: That means, by definition, that the fate of the money hangs entirely on faith. On the strength of the myth. And for many (most) people, the myth’s more or less plausible depending on things like debt-to-GDP ratios, budget balances and so on. Some argue those metrics have now deteriorated such that people — regular people — will begin to lose faith. If that happens at scale, it’s all over. Because, again, there’s no underlying reality to any of this. None whatsoever.

One early sign of lost faith is an untethered long-end. Policymakers will do pretty much anything to forestall a scenario where longer-term yields on sovereign debt spiral higher unchecked. An unmoored long-end is the beginning of the end because it presages a self-fulfilling prophecy. As debt service payments balloon, the fiscal stance worsens, prompting markets to demand even higher yields and so on, until you’re just borrowing money — or printing it — to pay interest on old debt. Once the plebeians get wind of that, the spell’s broken and life becomes “poor, nasty and brutish” in fairly short order.

And so it was that Japan indicated it’ll trim long-end bond sales going forward in a bid to allay the over-supply concerns that’ve contributed to the JGB curve’s bat-out-of-hell bear steepener. As Bloomberg put it, “the move underlines how Japan is seeking to regain stability in the market” following an unfortunate 20-year auction which betrayed just how little demand there is right now for DM duration.

As the figure shows, 40-year yields in Japan plummeted 25bps on Tuesday, a big rally which elicited a sympathy bid for gilts (which also benefited from conciliatory remarks by UK debt management boss Jessica Pulay) and the long-end of the Treasury curve, where yields north of 5% are a big problem for Scott Bessent and Donald Trump.

In their own coverage, Reuters confirmed that Japan’s indeed considering “trimming issuance of super-long bonds… as policymakers seek to soothe market concerns about worsening government finances.” There are no plans to reduce the total size of debt issuance, though, according to Reuters’s sources.

That latter point’s crucial. Whatever you want to say about the need to address overall debt burdens, the immediate, near-term concern is the long-end of these DM sovereign curves. Policymakers have to cap those yields or at least take steps to slow the rapidity of the selloff.

I’m exaggerating for dramatic effect, but if the world’s most important advanced economies lose their respective long-ends — really lose them — we’re all in a lot of trouble.

Fortunately, the fact that Japan can still engineer an enormous rally in its longest-maturity debt simply by talking about moving some issuance to the front-end suggests we’re nowhere near any sort of existential moment.

Then again, myths are like authoritarian political regimes in that, to paraphrase Keith Gessen, “One day they’re here; the next day, poof — they’re gone.”