Understanding collateral runs
In normal financial runs lenders want their money back. In collateral runs borrowers want their collateral back. In today’s highly collateralized financial system the institutions at risk are broker-dealers that lend and borrow cash in secured transactions and that use part of that liquidity to fund their own asset holdings. In collateral runs cash borrowers, such as hedge funds, have an incentive to rush to repay secured loans as soon as the liquidity of a broker-dealer is being questioned. That is because haircuts keep collateral value above loan notional. The demise of Bear Sterns in 2008 illustrates that the peril of collateral runs is real. Still, this source of liquidity risk has not been well explored.