FAS 157 strikes again
WSJ | Fail

[O]ver the past decade, various mark-to-market accounting rules became part of the official U.S. Generally Accepted Accounting Principles (GAAP), and began to be required by the Securities and Exchange Commission, bank regulatory agencies, credit rating agencies and in the Basel II international framework for measuring bank solvency.

This supposed "reform" is exacerbating the current crisis. Markets for individual loans are still much thinner than for stocks and bonds. The market for securitized loans with unique features is even thinner, and a disruptive event can cause these markets to virtually disappear. As a result, if a highly leveraged bank sells a mortgage-backed security at a steep discount, this becomes the "market price."

More on the point:

Paulson bailout would worsen contagion-spreading accounting rules
OpenMarket.org | Extra Fail