Judging the integrity and capital-allocation skill of the people running a business before trusting any number they report.
Munger and Buffett's core idea: you are not just buying a business, you are entering a long-term partnership with the people who allocate its capital. A brilliant business run by dishonest or irrational managers will eventually be looted or wasted — so character and rational capital allocation matter as much as the numbers on the page.
The financials look sound, the moat looks real — but every future decision about that capital runs through the people in charge.
Read years of shareholder letters, study decisions under pressure, check whether incentives are aligned with owners.
With integrity and rationality established, you can trust that retained earnings will be reinvested wisely, not squandered.
Buffett has repeatedly cited Tom Murphy as one of the best capital allocators he ever observed — running a lean corporate structure, avoiding empire-building, and consistently deploying capital where returns were highest.
Berkshire Hathaway itself operates on a deliberately thin corporate center, delegating operating decisions to subsidiary managers it trusts, while keeping capital allocation across the whole group concentrated with Buffett and Munger — a live example of trust-based structure.
Munger warned repeatedly about executives who spend more energy promoting the stock than running the business — a pattern investors have seen play out across numerous well-documented corporate collapses where accounting aggressiveness masked deteriorating fundamentals.
Read several years of shareholder letters in sequence to see how candidly mistakes are discussed.
Check insider ownership and buying or selling patterns for genuine alignment with shareholders.
Study the capital allocation track record — reinvestment, dividends, buybacks, and acquisitions.
Look for candor about failures, not just polished narratives about wins.
Examine compensation structure for alignment with long-term per-share value creation.
Judge rationality under pressure — how management behaved during a genuine downturn or crisis.
You want to be in business with people you would trust with your own money, run by people the same way you would run it if you had the full-time job yourself.