OTHER PEOPLE’S MONEY: Why the Repo Market Is Such a Big Deal — and Why Its $400 Billion Bailout Is So Unnerving.

The repo market seized up last week, with median repurchase rates skyrocketing from their usual band of 2.00-2.25% to 2.46% on Monday, and 5.25% on Tuesday. Keep in mind, that’s the median rate. Some repo rates were as high as 9%, more than quadruple the Federal Reserve’s own target rate, which usually puts a cap on how high Treasury repo rates could climb.

An unlucky confluence of events, including an exceptionally large demand for cash from U.S. companies that needed to pay their corporate tax bills, sucked a lot of the available cash out of the financial markets. What happened last week was any counter-party in need of cash, and only holding collateral like Treasuries, agreed to pay the much higher going repo rates. That’s supply and demand, plain and simple, and it mirrors what happened in certain repo markets in 2007 before the housing crash and the Great Recession that followed.

So, what happened to the usual abundance of cash and liquid securities that powers the trillion-dollar repo market?

In a word? Government.