There are at least eight reasonable explanations for recent price weakness --- there are at least eight excellent reasons why investors should be viewing this weakness as a buying opportunity. Clearly, the financial press has not attended any of my seminars on income investing. Lower prices and higher yields are good news for income investors!
Get rid of SFAS 157, which works something like this: While my bank owns my mortgage, it's worth full value. As part of a Ginny Mae--- still full value. But once it crosses over into the ether of CDOs and other multi-level Frankensteinesque monstrosities, my paid in advance mortgage becomes indistinguishable.