A number of corporations bought auction rate securities with their excess cash. They believed that since the instruments offered better yield than many market funds, they would be good for balance sheet management. They also thought that since auction-rate paper had been liquid and widely traded since 1985 that moving in and out of the market would be easy.
It was easy until it wasn't.
The investment banks and money center banks which made the market in these instruments pulled out at the beginning of the credit crisis. They did not want to keep risking their own capital to buy the paper and hold it to keep the market trading. Traditionally what was not bought at one auction was picked up by banks and held until the next round of trading. In essence, large financial firms kept the market trading by underwriting the system in exchange for large commissions.
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