Repo transactions
A “repo” transaction is basically a collateralized short-term loan. It is a popular way for banks and brokers to provide financing to hedge funds. A fund turns over securities as temporary collateral for a loan, then later buys back the securities at a higher price that includes interest on the loan. If the fund fails to repurchase the securities, the bank can just sell them. That’s why repo transactions are usually considered relatively safe.
A bank might lend 97 cents against the collateral of a high-quality mortgage security with a market value of $1 — a difference known as a “haircut” that insures the lender against losses. If the value of the collateral drops to 95 cents, the borrower faces a margin call.
Because repo loans often last only one day, hedge funds can find themselves in trouble literally overnight.
When hedge funds can’t come up with cash to meet a margin call, they are at risk of losing all access to credit and shutting down immediately. In that case, banks and brokers are forced to seize the collateral. If the collateral is of low-quality, it leaves them holding the troubled securities at the root of the hedge funds’ problems. This is why analysts say banks may have to take billions of dollars in further write-downs.
Source: WSJ