Repo Market

What Is the Repo Market?

A repurchase agreement (repo) is a short-term secured borrowing arrangement. In a repo, a borrower sells a bond to a lender with an agreement to buy it back the next day (or in a few days) at a slightly higher price. The price difference is the repo rate — effectively the interest on the loan.

From the lender's perspective, this is a "reverse repo" — they buy the bond and agree to sell it back.

Why Repo Matters

The repo market is the core funding mechanism for:

• Dealers and banks: Finance their bond inventories overnight
• Hedge funds: Leverage their fixed income positions (a fund can buy $1B of bonds and repo them out, using the cash proceeds to buy more)
• Money market funds: Invest their cash in overnight repo
• The Fed: Conducts monetary policy through open market operations in repo

The US repo market handles over $4 trillion in daily volume — it is the beating heart of the financial system.

The September 2019 Repo Crisis

In September 2019, overnight repo rates spiked from ~2.2% to 10%, threatening to disrupt the entire money market. The causes included:

1. A large Treasury settlement (cash was scarce)
2. Corporate tax payments draining reserves
3. Bank reserves had fallen too low after Fed QT

The Fed was forced to inject $75B/day in emergency repo operations. This event accelerated the end of QT and eventually led to the Fed restarting asset purchases.

Repo and the Plumbing Analogy

Repo is often called the "plumbing" of financial markets. When it works, nobody notices. When it breaks — as in September 2019 or the GFC — the effects cascade immediately through all markets.

What to Watch

• Repo rate vs Fed funds rate: Persistent spread signals stress
• Fed's RRP usage: High usage = abundant cash; declining = cash getting scarcer
• Dealer balance sheet capacity: Banks' ability to intermediate the repo market is constrained by balance sheet rules