Chapter 12: What can go wrong
This guide has spent eleven chapters moving money onto the safe shelf, so it owes you an honest accounting of the times the safe shelf cracked. There are three worth knowing, and they are worth knowing precisely, because each one was a different risk wearing the same disguise. Savers who fear the wrong risk sell the wrong thing at the wrong moment, and one of our cast spent four years proving it.
Three case files follow, each with receipts. Read them less like history and more like a field guide to telling four risks apart: duration, structure, concentration, and credit, which plays a supporting role in all three.
Case file 2022: duration, not default
The numbers first, because they shocked people who thought "bonds" meant "calm". In calendar 2022, the Bloomberg US Aggregate index, the broad core bond benchmark, returned −13.0%, its worst calendar year since its 1976 inception per market data. The 20+ year Treasury fund returned −31.4% (iShares, calendar 2022). Money market funds sailed through without a scratch.
Here is what did not happen in 2022: defaults. The US Treasury paid every coupon on schedule. Almost nothing in the core index failed to pay. What happened was Chapter 2's seesaw, at full force: the Federal Reserve raised rates faster than it had in decades, and the price of every existing bond fell by roughly its duration times the move, exactly as FINRA's rule of thumb describes. A fund full of bonds with a duration near six fell by an amount in that neighborhood; a fund holding 20+ year Treasuries, with a duration more than twice as long (the same fund's effective duration sits at 15.39 years as of June 11, 2026, per iShares), fell more than twice as far. The dial from Chapter 6 predicted the whole event in one multiplication.
And the cure was already inside the wound. The same rate rise that marked down old bonds pushed the yield on every new bill and bond higher, which is the recovery half of the story: holders who stayed put collected steadily rising interest, and the people who turned a paper loss into a permanent one were the ones who sold at the bottom.
Elaine was one of them, and this is where her story closes. She sold her core bond fund near the 2022 bottom, went all-cash, and spent four years afraid of both directions. This spring she reread her old statements with the seesaw in hand and saw what she could not see then: nothing she owned had defaulted, her fund had fallen almost exactly as its duration said it would, and the real mistake had been made years earlier, when retirement-spending money that would be needed within a couple of years was riding a fund with a six-year seat. Her ladder from Chapter 4 fixed the actual problem. Twelve rungs, every dollar with a date, and when her June rung matured at face value on schedule, she told her daughter the fear had finally found its right size: "I wasn't wrong that I could lose money. I was wrong about which money, and why."
The autopsy verdict, written plainly: 2022 was duration risk, fully disclosed in advance by a single number on every fund page. Safety never failed that year. Two clocks failed to match, and only one of them belonged to the fund.
Case file 2008: the buck breaks
A money market fund holds a basket of short-term IOUs and aims to keep its share price pinned at exactly $1, so that a dollar in is always a dollar out. On September 16, 2008, the Reserve Primary Fund, a $62 billion money market fund, wrote off $785 million of Lehman Brothers paper the day after Lehman failed and repriced its shares at $0.97. Three cents on the dollar does not sound like catastrophe, but the entire product rested on the promise of the unbroken buck, and a promise broken at one fund put every similar fund in doubt. The run that followed spread across prime money funds and stopped only when the US Treasury stepped in days later to guarantee money fund balances (NY Fed).
This is structure risk: the danger that lives in how a product is built rather than in any single borrower. The trigger was credit (Lehman's paper), but the damage came from the design, a stable-price promise with no insurance behind it. A money market fund is an investment, not a deposit, and no FDIC stands behind its $1.
Two sentences cover what changed since. Regulators tightened money fund rules in rounds after 2008, pushing the funds toward shorter, higher-quality, more liquid holdings and clearer labels. In July 2023 the SEC finished the latest round, removing the redemption gates that had let funds lock the exits and instead requiring institutional prime funds to charge mandatory liquidity fees in times of stress, so that leaving in a panic carries its own cost rather than trapping everyone else (SEC).
Could a money fund break the buck again?
In principle, yes; it has happened at scale exactly once in the product's history, and the rules have been tightened three times since. The practical answer for a saver is about fund type and job. Government money funds hold government paper, which is the boring end of an already boring market; prime funds reach for a little extra yield in corporate paper, and that reach is where 2008 lived. If a particular dollar absolutely cannot tolerate even the small, slow form of this risk, that dollar belongs behind FDIC insurance or in a Treasury bill you hold to maturity, both of which Chapter 1 priced for you. For everything else, know which kind of fund you own; the word "government" or "prime" is in the name.
Case file 2023: the run with a spreadsheet
Silicon Valley Bank's failure looks like a bond story from one angle and a deposit story from the other, and the deposit angle is the one that matters for this guide. At year-end 2022, about 94% of SVB's deposits were uninsured, sitting above the $250,000 FDIC line, mostly the operating cash of companies. On March 8, 2023, the bank announced it had sold $21 billion of bonds at a $1.8 billion loss, the 2022 duration story replayed on a bank's own balance sheet: long bonds bought when rates were low, sold after rates rose. Uninsured depositors did the math overnight. On March 9 they pulled over $40 billion, another $100 billion was queued for March 10, and regulators closed the bank that morning (Federal Reserve's Barr report; GAO).
Now the part that belongs in your playbook: insured depositors lost nothing. Every saver under the $250,000 line, in every ownership category, was made whole as a matter of course, which is what the insurance is for. The people sweating that weekend were the ones holding seven figures at a single bank, the exact arithmetic Chapter 11 just taught you to check in fifteen minutes a year. The risk's name is concentration, and unlike duration it does not even pay you for carrying it.
Which risk lives on which shelf
The wrong lesson from these stories is generalized fear. The right lesson is a map: each shelf in this guide carries one main risk, and it is rarely the one headlines suggest.
| Shelf | The risk that actually lives there |
|---|---|
| Insured savings and CDs, under the limits | none of the big four; just a rate that resets over time |
| Government money market fund | structure, in its mildest form: a stable-price aim, not a guarantee |
| T-bill held to maturity | none in dollar terms at maturity; reinvestment rates on the roll |
| Core and long bond funds | duration, in proportion to the number on the fund page |
| Corporate and high-yield bonds | credit: the spread is the worry, priced |
| Deposits over $250,000 at one bank | concentration, uncompensated |
Where people go wrong follows directly from the map. They fear default and accept duration, buying a long Treasury fund for "safety" and meeting 2022. They fear the wiggle and sell at the bottom, converting a predictable markdown into a permanent loss, which was Elaine's four expensive years. They fear banks in general and then hold five times the insurance limit at one of them, which was the actual SVB lesson. Precision is the whole game: name the risk on the label before you react to the one in the headline.
What if the US missed a Treasury payment?
Politics produces a debt-ceiling standoff every few years, and so far each one has ended with every bill paid. The market's working assumption remains that Treasury interest arrives on schedule, which is why Treasuries still anchor the pricing of nearly everything else, including the insured deposits and money funds in this guide. Nothing in this playbook depends on heroics: if that assumption ever truly failed, no shelf on the cash aisle would stand apart from the wreckage, so the plan that makes sense before such a day is the same plan that makes sense regardless, and this guide already gave it to you.
Every shelf carries one true risk: duration on funds, credit on corporates, structure on money funds, concentration above the FDIC line. Name the one you actually hold, defend against that one, and let the headlines fear the rest.
Key takeaways
- 2022 was duration, not default: the core index fell 13.0% and long Treasuries 31.4% (calendar 2022) while every Treasury coupon paid on time, and the same rate rise lifted every new bond's yield, which was the recovery.
- 2008 was structure: a $62 billion money fund wrote off $785 million of Lehman paper, broke the buck at $0.97 on September 16, 2008, and the run stopped only with a Treasury guarantee. The SEC's July 2023 reform replaced exit gates with liquidity fees on institutional prime funds in stress.
- 2023 was concentration: SVB held 94% uninsured deposits at year-end 2022, lost $1.8 billion on a $21 billion bond sale, saw over $40 billion leave on March 9, and was closed the next morning. Insured depositors lost nothing.
- A Treasury default stays off the case-file list: standoffs recur, the working assumption holds, and nothing in this playbook depends on heroics either way.
- The map beats the mood: match each shelf to its one real risk, and spend your fear there.
Sources: NY Fed on 2008 money funds · SEC 2023 money fund reform · Federal Reserve SVB report · FDIC deposit insurance FAQ · FINRA on duration · iShares AGG · iShares TLT