Mortgage crisis could lead to $2 trillion shrinkage in credit

The New York Times tells us today that Goldman Sachs was one of the few large investment banks that dumped it's mortgage and mortgage derivative holdings before the crash. Now, they forecast disaster for the US economy:

LONDON (Reuters) - The impact of the U.S. mortgage market crisis on the underlying economy could be "dramatic" as leveraged investors may need to scale back lending by up to $2 trillion, according to investment bank Goldman Sachs (GS.N).

In a report dated November 15, Goldman's chief U.S. economist Jan Hatzius said a "back-of-the-envelope" estimate of credit losses on outstanding mortgages, based on past default experience, was around $400 billion.

But unlike stock market losses, which are typically absorbed by "long-only" investors, this mortgage-related hit is mostly borne by leveraged investors such as banks, broker-dealers, hedge funds and government-sponsored enterprises.

And leveraged investors react to losses by actively cutting back lending to keep capital ratios from falling -- A bank targeting a constant capital ratio of 10 percent, for example, would need to shrink its balance by $10 for every $1 in losses.

"The macroeconomic consequences could be quite dramatic," Hatzius said in the note to clients. "If leveraged investors see $200 billion of the $400 billion aggregate credit loss, they might need to scale back their lending by $2 trillion."

"This is a large shock," he said, adding the number equates to 7 percent of total debt owed by U.S. non-financial sectors.

Not a pretty picture.