what cause the shock of SIV

--credit market turbulence made all money market investors leery of commercial paper, especially ABCP. --Part of the shock stems from the conventional investor wisdom that SIVs were safe havens to park cash. They have traditionally been viewed as prime vehicles, and rated as such, and differ from other blind investment pools such as collateralized loan obligations or collateralized debt obligations because SIV investors are first in line to be paid if the loans in the pool declared bankruptcy. That made SIV investors feel even more comfortable.