NEW YORK – In January 2022, when yields on US ten-year Treasury bonds were still roughly 1% and those on German Bunds were -0.5%, I warned that inflation would be bad for both stocks and bonds. Higher inflation would lead to higher bond yields, which in turn would hurt stocks as the discount factor for dividends rose. But, at the same time, higher yields on “safe” bonds would imply a fall in their price, too, owing to the inverse relationship between yields and bond prices.

This basic principle – known as “duration risk” – seems to have been lost on many bankers, fixed-income investors, and bank regulators. As rising inflation in 2022 led to higher bond yields, ten-year Treasuries lost more value (-20%) than the S&P 500 (-15%), and anyone with long-duration fixed-income assets denominated in dollars or euros was left holding the bag. The consequences for these investors have been severe. By the end of 2022, US banks’ unrealized losses on securities had reached $620 billion, about 28% of their total capital ($2.2 trillion).

Making matters worse, higher interest rates have reduced the market value of banks’ other assets as well. If you make a ten-year bank loan when long-term interest rates are 1%, and those rates then rise to 3.5%, the true value of that loan (what someone else in the market would pay you for it) will fall. Accounting for this implies that US banks’ unrealized losses actually amount to $1.75 trillion, or 80% of their capital.

The “unrealized” nature of these losses is merely an artifact of the current regulatory regime, which allows banks to value securities and loans at their face value rather than at their true market value. In fact, judging by the quality of their capital, most US banks are technically near insolvency, and hundreds are already fully insolvent.

To be sure, rising inflation reduces the true value of banks’ liabilities (deposits) by increasing their “deposit franchise,” an asset that is not on their balance sheet. Since banks still pay near 0% on most of their deposits, even though overnight rates have risen to 4% or more, this asset’s value rises when interest rates are higher. Indeed, some estimates suggest that rising interest rates have increased US banks’ total deposit-franchise value by about $1.75 trillion.

But this asset exists only if deposits remain with banks as rates rise, and we now know from Silicon Valley Bank and the experience of other US regional banks that such stickiness is far from assured. If depositors flee, the deposit franchise evaporates, and the unrealized losses on securities become realized as banks sell them to meet withdrawal demands. Bankruptcy then becomes unavoidable.

Moreover, the “deposit-franchise” argument assumes that most depositors are dumb and will keep their money in accounts bearing near 0% interest when they could be earning 4% or more in totally safe money-market funds that invest in short-term Treasuries. But, again, we now know that depositors are not so complacent. The current, apparently persistent flight of uninsured – and even insured – deposits is probably being driven as much by depositors’ pursuit of higher returns as by their concerns about the safety of their deposits.

In short, after being a non-factor for the last 15 years – ever since policy and short-term interest rates fell to near-zero following the 2008 global financial crisis – the interest-rate sensitivity of deposits has returned to the fore. Banks assumed a highly foreseeable duration risk because they wanted to fatten their net-interest margins. They seized on the fact that while capital charges on government-bond and mortgage-backed securities were zero, the losses on such assets did not have to be marked to market. To add insult to injury, regulators did not even subject banks to stress tests to see how they would fare in a scenario of sharply rising interest rates.

Now that this house of cards is collapsing, the credit crunch caused by today’s banking stress will create a harder landing for the real economy, owing to the key role that regional banks play in financing small and medium-size enterprises and households. Central banks therefore face not just a dilemma but a trilemma. Owing to recent negative aggregate supply shocks – such as the pandemic and the war in Ukraine – achieving price stability through interest-rate hikes was bound to raise the risk of a hard landing (a recession and higher unemployment). But, as I have been arguing for over a year, this vexing tradeoff also features the additional risk of severe financial instability.

Borrowers are facing rising rates – and thus much higher capital costs – on new borrowing and on existing liabilities that have matured and need to be rolled over. But the increase in long-term rates is also leading to massive losses for creditors holding long-duration assets. As a result, the economy is falling into a “debt trap,” with high public deficits and debt causing “fiscal dominance” over monetary policy, and high private debts causing “financial dominance” over monetary and regulatory authorities.

As I have long warned, central banks confronting this trilemma will likely wimp out (by curtailing monetary-policy normalization) to avoid a self-reinforcing economic and financial meltdown, and the stage will be set for a de-anchoring of inflation expectations over time. Central banks must not delude themselves into thinking they can still achieve both price and financial stability through some kind of separation principle (raising rates to fight inflation while also using liquidity support to maintain financial stability). In a debt trap, higher policy rates will fuel systemic debt crises that liquidity support will be insufficient to resolve.

Central banks also must not assume that the coming credit crunch will kill inflation by reining in aggregate demand. After all, the negative aggregate supply shocks are persisting, and labor markets remain too tight. A severe recession is the only thing that can temper price and wage inflation, but it will make the debt crisis more severe, and that in turn will feed back into an even deeper economic downturn. Since liquidity support cannot prevent this systemic doom loop, everyone should be preparing for the coming stagflationary debt crisis.

Nouriel Roubini, Professor Emeritus of Economics at New York University’s Stern School of Business, is Chief Economist at Atlas Capital Team and the author of MegaThreats: Ten Dangerous Trends That Imperil Our Future, and How to Survive Them (Little, Brown and Company, 2022).

© Project Syndicate 1995–2023