The author is an FT contributing editor

The well-known quantum mechanics thought experiment posits that if a cat is sealed in a field with a lethal substance, you’ll be able to’t know whether or not it’s nonetheless alive till you open stated field. Within the meantime, it’s concurrently alive and lifeless. And so it’s with banking at this time: we will’t know if the previous week was a sequence of idiosyncratic, containable points or the beginning of a 2008-style banking disaster. In the intervening time it’s each.

Buyers and depositors should not solely consider that banks have good capital ratios, ample entry to liquidity and behave responsibly, but additionally that the supervisory and regulatory structure put in place after 2008 to avoid wasting the system works. Within the brief time period, there could be gradations of confidence in all of this. However once we lastly look within the field, buyers should both belief all of this stuff or none. It’s a binary end result: the cat can’t be a little bit bit lifeless.

Cause factors to the latest banking instability being a sequence of containable points, principally based mostly on supervisory and administration points. Silicon Valley Financial institution, Silvergate Financial institution and Signature Financial institution have been unusually uncovered to rate of interest threat by way of each their clientele (itself a phenomenon of a low-rate atmosphere) and their property (long-term bonds that needed to be offered at an enormous loss to redeem deposits). First Republic, with a rich depositor base that may largely be uninsured, has additionally been caught up in considerations about liquidity. Credit score Suisse, in hassle many instances earlier than for a litany of causes, is now coping with each confidence and liquidity considerations.

The excellent news is lots has modified since 2008. Banks are much better capitalised and controlled than earlier than the worldwide monetary disaster. And as terrible as that interval was, we learnt many classes from it, amongst them the significance of swift, decisive motion to stem contagion.

Central banks instantly dusted off the playbook for addressing a liquidity disaster and stepped in as lenders of final resort. The US Federal Reserve, Treasury and FDIC assured all deposits for SVB and Signature Financial institution, and the Fed created a brand new lending programme, the Financial institution Time period Funding Program, for banks with underwater securities on the books to entry at par. The Swiss Nationwide Financial institution prolonged a credit score line of as much as SFr50bn ($54bn) to Credit score Suisse.

The unhealthy information is that thus far belief within the banking sector has not been restored. Every week after the US programmes have been introduced, First Republic stays beneath strain — even after receiving $30bn in deposits from bigger banks. Its shares fell 33 per cent on Friday. All the banks within the KRE banking ETF have been down; the index closed off by 6 per cent. Fed information confirmed it loaned $11.9bn by way of its new facility within the week up till final Thursday and a document excessive of $152.9bn by way of its normally stigmatised low cost window. Clearly, liquidity is a priority throughout the US system. And regardless of the brand new credit score line, Credit score Suisse and its rival UBS AG have spent the weekend negotiating an acquisition.

Central banks and regulators should do extra to revive confidence. Basic belief within the banking system is wobbling. And I fear extra poisonous issues would possibly nonetheless be added to Schrödinger’s field. Industrial actual property loans account for about 28 per cent of small banks’ loans within the US (relative to eight per cent for the most important banks). A few of these are underwater given excessive rates of interest and the pandemic shift to working from house. If even just a few small banks have to write down down property, solvency questions will grow to be contagious.

One other threat lies in non-public markets. They don’t have to mark to market, and have booked a lot smaller paper losses than public markets over the previous 12 months. They might delay crystallising losses within the hopes that asset values reflate within the meantime. If property proceed to fall, nevertheless, the losses may very well be staggering. Personal markets may undermine monetary stability.

We shouldn’t assume the cat is lifeless and a banking disaster is upon us, however we are going to preserve hitting pockets of market dislocation as central banks proceed to withdraw liquidity by elevating charges and shrinking stability sheets. That is the third time in twenty years we’ve had banking points, after the monetary disaster and eurozone disaster. Extra must be finished to rebuild and keep confidence within the system. Even when the cat is alive this time, we will’t assume it has 9 lives.