The Repo Market’s a Mess. (What’s the Repo Market?)

When plumbing works well, you don’t need to think about it. That’s usually the case with a vital but obscure part of the financial system known as the repo market, where vast amounts of cash and collateral are swapped every day. But when it springs a leak, as it did in mid-September, it rivets the attention of the U.S. Federal Reserve, the nation’s largest banks, money-market funds, corporations and other big investors. It even gets airtime on National Public Radio. The Fed calmed things down by pumping in billions of dollars, but it may have a lot more work to do on the pipes -- and a lot more money to lay out.

It’s where piles of cash and pools of securities meet, resulting in more than $3 trillion in debt being financed each day. Repo is short for repurchase agreements, transactions that amount to collateralized short-term loans, often made overnight. Repo deals let big investors -- such as mutual funds -- make money by briefly lending cash that might otherwise sit idle, and enable banks and broker-dealers to get needed financing by loaning out securities they hold in return. A healthy repo market is more than the world’s biggest pawn shop: It helps a wide range of other transactions go more smoothly -- including trading in the over $16 trillion U.S. Treasury market.