Lesson 5 of 7
The 2008 financial crisis
Leverage, short-term funding and hard-to-value assets ran through the 2008 crisis, and turned a bank's book value into the question that mattered most.
By Javier Sanz
Founder of ValueScreener. Built Ninety Nine, a securities services provider, and sold it to a tier-one global bank; ran operations and internationalization at Alpaca, the brokerage API.
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In one minute
- A small loss in a highly borrowed balance sheet becomes a large loss in the equity sitting under it.
- The S&P 500 with dividends lost 37.0 percent in 2008, after a small gain the year before and a large rebound the year after.
- Complex assets that are hard to value independently made a bank's own book value, not its earnings, the question investors most needed answered.
The 2008 financial crisis ran through banks that had borrowed heavily against assets whose value turned out to be harder to pin down than their balance sheets suggested. A modest loss on those assets became a much larger loss to the equity holding them up.
One large losing year, bracketed by gains
- 20075.5%
- 2008−37.0%
- 200926.5%
Leverage turns a small loss into a large one
Reading a bank, in Industries that need their own ratios, sets out the same arithmetic with net interest margin and credit costs: a bank's business is borrowing short and lending long, and the same structure that earns its spread magnifies any loss on the assets it holds.
Short-term funding on long-lived assets
The Financial Crisis Inquiry Commission's 2011 report traced how institutions funded long-lived mortgage assets with short-term borrowing that had to be renewed constantly. That funding is cheap when lenders trust the assets behind it. Once that trust is in question, the funding itself can disappear well before the underlying asset matures, forcing a sale at whatever price is on offer.
The mismatch is the same one every bank runs on a smaller, ordinary scale: deposits can be withdrawn far sooner than a mortgage is repaid. The crisis was that mismatch stretched further than usual, across more of the system at once, with short-term lenders who could pull back within days set against assets that would not mature for decades.
Why book value became the question
Many of the assets on a bank's balance sheet in 2008 were securitised pools of loans, complex enough that two banks holding similar pools could carry very different values for them. An income statement reports what a business already earned. A balance sheet built on assets this hard to independently price is read for whether the equity underneath it is real, which is why price to book, not the P/E, was the ratio investors reached for.
Three dates
How the year unfolded
- March 2008Bear StearnsA large securities firm is rescued through an assisted sale rather than allowed to fail on its own.
- September 2008Lehman BrothersA large investment bank files for bankruptcy, the point at which short-term funding across the industry seizes up.
- October 2008TARPCongress authorises funds to buy troubled assets; Treasury uses them to put capital into banks.
Check yourself
A bank has $100 of assets and $10 of equity. Its assets fall 5 percent in value. What happens to its equity?
- It also falls 5 percent
- It falls to $5, a 50 percent drop
- It is unaffected, since equity is separate from the assets
Show the answer
Answer: B.
With $90 of liabilities that do not move, a $5 fall in assets comes entirely out of the $10 of equity: a 50 percent drop from a 5 percent asset loss.Why could short-term funding force a bank to sell long-lived assets?
- Regulators required an annual sale of assets
- Lenders could refuse to renew within days, long before the assets matured
- Long-lived assets cannot legally be held past one year
Show the answer
Answer: B.
A bank's short-term funding must be renewed constantly. Once lenders refuse to renew, the bank must raise cash from assets that will not mature for years or decades.Why did price to book, rather than the P/E, become the ratio investors reached for during this crisis?
- Banks stopped reporting earnings
- The assets behind the balance sheet were hard to independently value, so the equity itself was the open question
- Book value is always more reliable than earnings
Show the answer
Answer: B.
An income statement reports what already happened. The doubt in 2008 was whether the assets on the balance sheet were worth what they were carried at, which is a book-value question.Sources
- Financial Crisis Inquiry Commission, The Financial Crisis Inquiry Report, 2011.
- Berkshire Hathaway 2025 annual report, table "Berkshire's Performance vs. the S&P 500": S&P 500 with dividends, by calendar year, 1965 to 2025.
What this leaves out
- The leverage example uses round, invented figures and ignores risk-weighting and off-balance-sheet exposure, both of which mattered in the real crisis and are not modelled here.
- The Timeline names three widely reported dates and does not attempt a full account of the year; other institutions and events are not covered.
- Nothing here is advice about any bank or any security.