Why Banking Is a Business You Should Approach With Extreme Caution — and Occasionally, Conviction
Banking is complexity by design. And complexity, by its very nature, creates better opportunities for mistakes to go unnoticed and fraud to go undetected. You will encounter more of both than you woul
Banking is complexity by design. And complexity, by its very nature, creates better opportunities for mistakes to go unnoticed and fraud to go undetected. You will encounter more of both than you would in simpler businesses.
Charlie Munger put it plainly: a natural gas business will always have more explosions than a sand business. Large financial institutions, by their nature, are prone to more problems — and this will always be true, even when the institution is government-owned.
This is not a reason to avoid the sector entirely. It is a reason to be clear-eyed about what you are dealing with before you start.
1. Systemic Risk
Lending money to others is hard. Lending unstable money to others is banking’s original problem.
(1) Structural Fragility
Unlike the float in property and casualty insurance — which cannot be withdrawn — bank deposits can walk out the door at any moment. Go a step deeper and the problem compounds: the money sitting in a bank is, almost by definition, money that its owner did not want to lock up. Depositors with longer time horizons and higher risk tolerance have already moved their capital into equities, long-duration bonds, or private investments. What remains in demand deposits is precisely the most footloose capital, held by people most sensitive to uncertainty.
“When people are scared, they’re really scared.” Buffett needed only one sentence. No capital requirement can truly protect a bank against a genuine run.
When systemic stress hits, deposits flee while loans cannot be recalled on the same timeline. Layer 20-to-1 leverage on top of that mismatch, and the risk of total wipeout is real. This structural fragility is exactly why central banks and deposit insurance exist — not merely to prevent bad management, but to interrupt a more fundamental failure mode: individually rational behavior (pulling your money from a bank that might be in trouble) can produce collective catastrophe.
(2) Poor Evaluability
Financial companies are far harder to assess than businesses with tangible products or retail operations. Loan quality is inherently difficult to evaluate. Nobody can accurately calculate the “right” level of loan loss reserves — even the “reasonable range” is elusive — which makes it easy for management to report virtually whatever earnings number they choose.
This is not merely an estimation problem. It creates a perverse incentive structure: management can understate reserves to inflate reported profits, collect bonuses, and leave the cost to future shareholders. Buffett’s observation has held for decades: “Over time, you will see all kinds of fraud and all kinds of big mistakes, year after year, one after another.” This is not a bug. It is a feature of the incentive architecture.
What makes it worse is that the problems are slow to surface. In most industries, cash flow stress provides an early warning. Financial institutions are different: they can cross the point of insolvency while the balance sheet still looks flush. They can walk all the way to ruin while money is still flowing freely around them. By the time the problem becomes visible, it is usually too late.
2. Institutional Imperative
Banking has two structural contradictions built into its foundation.
The first: you are lending out money that depositors can demand back at any time.
The second: money is a perfectly homogeneous product. You cannot make a loan “better” than a competitor’s. There is no brand, no feature differentiation, no switching cost to protect you on the asset side.
In an industry where the product is identical and the only visible performance metrics are net interest margin and asset growth, the competitive pressure runs in one direction. Widening your margin has two main levers: (1) borrow short and lend long — but not too long (SVB in 2023 is the textbook example of what happens when you do); or (2) loosen underwriting standards and chase higher-risk borrowers.
This creates a profoundly destructive dynamic. When peers are making money on a real estate bubble or a high-yield asset class, the conservative bank looks like it’s falling behind in the short term — losing customers, facing shareholder pressure, watching its stock underperform. Worse, sound underwriting and reckless underwriting are nearly indistinguishable at the moment a loan is made. The difference only emerges when the credit cycle turns.
This is why banking crises repeat. Buffett has consistently tied the “institutional imperative” — executives mindlessly imitating peers — to banking more tightly than almost any other industry. Bankers play follow-the-leader with lemming-like zeal. Then they experience a lemming-like fate.
3. Management Character, High Returns, and Where to Look
If you can screen out the risk of systemic wipeout, and find a management team that genuinely resists the institutional imperative — one that has demonstrated, through prior credit cycles, the discipline to say no when peers are saying yes — banking is actually a very attractive business.
The math is straightforward: with roughly 1% ROA and 20x leverage, ROE can reach 15% or higher. And unlike many high-return businesses that cannot absorb additional capital at similar rates, a well-run bank can redeploy retained earnings at comparable returns for decades. Buffett saw this clearly in Wells Fargo:
“Wells Fargo is big — it has $56 billion in assets — and has been earning more than 20% on equity and 1.25% on assets.”
Today, DBS and JPMorgan both sustain ROE above 15% and have demonstrated the capacity to reinvest retained earnings at similar rates. Few business models can claim both, durably, over long periods.
That said, the evaluability problem never disappears for diversified financial conglomerates. The more complex the institution, the more places problems can hide, and the harder it is for any outsider — or even insider — to know the true state of the balance sheet.
At comparable management quality, focused specialists tend to be the better investment. AMEX’s moat is the spending power of its cardholders and the economics of merchant fees — a short, legible logic chain. Capital One’s moat is data-driven underwriting in consumer credit — again, specific and traceable. In both cases, the business model has fewer degrees of freedom, fewer places to hide a mistake, and a more observable relationship between inputs and outputs.
The framework for investing in banks, then, is not complicated — but it is demanding:
Eliminate the institutions where systemic risk or poor liability structure makes wipeout a real possibility.
Find management teams whose track record through prior downturns demonstrates genuine resistance to the institutional imperative.
Among those that pass both filters, prefer the specialists over the conglomerates.
Pay a fair price. At 20x leverage, management quality is the dominant variable — and you do not get a discount for buying a poorly-managed bank cheaply.
As Buffett wrote in 1991: “Because leverage of 20:1 magnifies the effects of managerial strengths and weaknesses, we have no interest in purchasing shares of a poorly-managed bank at a ‘cheap’ price. Instead, our only interest is in buying into well-managed banks at fair prices.”