How Berkshire Values Insurance
high confidence — compiled with source citation from the investment brain.
How Berkshire Values Insurance
How Berkshire Values Insurance
Buffett's framework for valuing an insurer is explicit and has been stable for decades. In the 1998 letter — the year Berkshire closed the General Re acquisition — he reduced it to a three-part test: "The key determinants are: (1) the amount of float that the business generates; (2) its cost; and (3) most important of all, the long-term outlook for both of these factors."
Float is the asset; underwriting loss is its price
Float is defined in the same 1998 letter as "money we hold but don't own." It arises because "premiums are received before losses are paid." The economic test is not the size of the float but its cost:
An insurance business has value if its cost of float over time is less than the cost the company would otherwise incur to obtain funds. But the business is a lemon if its cost of float is higher than market rates for money.
Buffett's distinctive claim is that Berkshire's float has historically carried a negative cost: "Our average cost over the 32 years has been well under zero. In aggregate, we have posted a substantial underwriting profit, which means that we have been paid for holding a large and growing amount of money." He calls this "the best of all worlds" and notes that Berkshire's net float, though a balance-sheet liability, "has had more economic value to us than an equal amount of net worth would have had."
That framing is the link to insurance-float and to the broader idea that underwriting discipline — not growth — is what makes an insurer worth owning.
Underwriting discipline is the moat
Buffett treats the underwriting line as the discipline that determines whether float is an asset or a liability. At geico, he singles out Tony Nicely for holding the line while growing: in the 1998 letter, "there is no one in the business world who could run GEICO better than Tony does", and in the 2008 letter he credits Nicely with "maintaining disciplined underwriting" even as GEICO's auto-market share climbed from 2.0% (1993) toward 7.7% (2008).
The same test applies to the reinsurance arms. On General Re, Buffett is candid that the 1998 purchase was a mistake in its original form — the firm's culture had "exhibiting a loss of discipline in underwriting, reserving and expenses" by 2001 — and that the recovery came only when Joe Brandon and Tad Montross restored discipline. By contrast, Ajit Jain's reinsurance unit is held up as the model: a 31-person operation that quotes "very large transactions" with incredible speed of execution and a willingness to quote on policies that leave others scratching their heads.
Reserve latitude is the hidden risk
Buffett warns that the insurance economics above are easy to misestimate, which is why discipline matters for investors too, not just managers:
Because loss costs must be estimated, insurers have enormous latitude in figuring their underwriting results, and that makes it very difficult for investors to calculate a company's true cost of float. Errors of estimation, usually innocent but sometimes not, can be huge.
His own stance is conservative presentation "because we have found that virtually all surprises in insurance are unpleasant ones." This is the same earnings-quality skepticism he applies elsewhere (see what-is-quality-earnings), and it is why the 2016 letter can warn that float earnings "will steadily fall" as legacy bonds mature and are replaced by "bonds yielding a pittance."
The bottom line
Berkshire values insurance as a financing business, not a premium-growth business: the franchise is worth something only if it produces float at a cost below (ideally below zero) the market rate, and that in turn requires underwriting discipline rather than market-share pursuit. Buffett's summary in the 2008 letter — "Our insurance operation, the core business of Berkshire, is an economic powerhouse" — rests on that discipline, which is the durable advantage protecting Berkshire's returns (see moats and permanent-loss-of-capital).
See also
Sources
berkshire-hathaway/Letters-Markdown/1998 - Letter to Shareholders.mdberkshire-hathaway/Letters-Markdown/2008 - Letter to Shareholders.mdberkshire-hathaway/Letters-Markdown/2016 - Letter to Shareholders.md