March 2020: When Even Treasuries Stopped Trading
For about a week in March 2020, the deepest market on earth traded like a broken small cap. The dash for cash forced the Federal Reserve into the largest market rescue ever staged, and it permanently changed what "risk free" is understood to mean.
The Safe Asset That Stopped Acting Safe
The US Treasury market is the reference point for every other price in global finance, roughly 20 trillion dollars of government debt at the time, assumed to be sellable instantly in any size at any moment. In a normal panic, money flees risky assets into Treasuries, pushing their prices up and yields down. The first days of the COVID crash followed that script. Then, in the second week of March 2020, the script broke: stocks kept crashing, and Treasury prices started falling too, with yields on long maturities lurching higher in chaotic swings. The one reliable relationship in markets, when everything falls, bonds rally, had failed. There was no longer a safe asset to run to, because investors had moved past safety to the only thing left: raw dollars.
The Dash for Cash
Economists later named the episode the dash for cash, and the sellers were exactly the holders assumed to be permanent. Foreign central banks sold Treasuries to raise dollars for defending their currencies and supplying their banks. Bond mutual funds sold their most liquid asset, Treasuries, to meet waves of redemptions. Hedge funds running leveraged relative value trades, including the cash futures basis trade, were forced by margin calls to dump bonds into a falling market. Corporations drew credit lines and money funds shed assets. Everyone needed the same thing at the same instant, dollars today, and the way to get dollars was to sell the most sellable thing you owned.
Liquidity evaporated in plain sight. Quoted spreads between bid and ask on off the run Treasuries, older issues that trade less actively than the newest ones, blew out to many times normal, and market depth, the size you could actually trade near the quote, collapsed even in the newest issues. Trades that would have been routine on any other day moved prices like boulders dropped in a pond.
Why Dealers Could Not Absorb It
The market\'s designated shock absorbers are the primary dealers, the banks that trade directly with the Fed and are expected to buy when clients sell. But dealer balance sheets were already stuffed with Treasuries after years of record government issuance, and post 2008 capital rules made warehousing hundreds of billions more expensive exactly when it was most needed. The sellers had trillions to move; the intermediaries had capacity for a fraction of it. The queue to the exit was the crisis.
March 2020\'s deepest lesson: liquidity is not a property of an asset, it is a property of the system around the asset. Even the world\'s safest security stops trading when everyone needs the same side of the same trade and the middlemen are full.
The Fed Goes Unlimited
The Federal Reserve\'s response escalated from large to historic in under three weeks. An emergency half point rate cut on March 3 did nothing for market plumbing. On March 12 the New York Fed offered trillions in repo financing, collateralized cash loans against Treasuries, to flush dealers with funding. On Sunday, March 15, the Fed cut rates to zero and announced 700 billion dollars of asset purchases. The selling continued. Finally, on March 23, the Fed removed the number entirely: it would buy Treasuries and mortgage securities in the amounts needed, full stop. At the peak it was purchasing on the order of 100 billion dollars per day, buying about 360 billion of Treasuries in the single week of March 25, and roughly a trillion dollars within weeks, alongside dollar swap lines for foreign central banks and a facility letting them borrow against their Treasuries instead of selling them.
| Date, 2020 | Federal Reserve action |
|---|---|
| March 3 | Emergency half point rate cut |
| March 12 | Trillions offered in repo financing |
| March 15 | Rates to zero, 700 billion in purchases announced |
| March 23 | Purchases made unlimited, "in the amounts needed" |
It worked. Spreads narrowed within days of the March 23 announcement, and by April the Treasury market was functioning again, weeks before the real economy found any footing.
The Long Shadow
In hindsight, March 2020 became the reference case for a decade of market structure reform. The Fed temporarily exempted Treasuries from bank leverage rules to free dealer capacity, then let the exemption lapse, keeping the underlying constraint alive as a policy argument. Official post mortems dissected the basis trade unwind and dealer capacity limits, and the push that followed, culminating in the SEC\'s central clearing mandate for Treasuries adopted in the end of 2023, traces directly to that week. A standing repo facility now exists so dealers never again wait on an emergency announcement. Every subsequent stress, from the 2022 gilt crisis to the tariff volatility of April 2025, was instantly compared against the March 2020 template: watch the Treasury market, because that is where the real crisis shows first.
The Bottom Line
March 2020 proved that even the risk free asset depends on plumbing: on dealer balance sheets, repo funding, and the assumption that not everyone sells at once. When that assumption failed, only a buyer with infinite capacity could restore it, and the Fed became that buyer in eleven days flat. The dash for cash is now the permanent nightmare scenario regulators design against, and the reason the phrase "market functioning" sits beside inflation and employment in the central banking vocabulary.