Monday, November 3, 2008

"But as AIG was aware, his models didn't attempt to measure the risk of future collateral calls or write-downs"

Felix Salmon on AIG's mistakes:

"The WSJ shines a bit more light on what went wrong at AIG today, with a story centering on the chap who designed its risk models, Gary Gorton. In a nutshell, anybody writing credit protection runs two risks: the default risk of the underlying security, on the one hand, and market risk, on the other. It seems that AIG only ever asked Gorton to worry about default risk; no one ever bothered to calculate the risk that CDS spreads would gap out, forcing AIG to take billions of dollars in mark-to-market losses and post many billions of dollars more in collateral."

Really? Fine work. What if your credit rating decreases or bonds decline in trading value?

"At heart, here, is an age-old debate over the value of any fixed-income instrument. Let's say you buy a bond at par which makes all its interest and principal payments in full and on time. Then you're happy, and making money. But let's say that a couple of years after issue, that bond is trading at just 10 cents on the dollar. Have you lost money?

As far as AIG was concerned, it was one of the biggest companies in the world, more than capable of weathering any mark-to-market storm -- and therefore all it cared about was default risk, not market risk. But as a result, it took on much more market risk than it was really aware of -- and that market risk ended up forcing the entire company into the arms of the US government.

The lesson, of course, is simple, but hard to learn: it's not the risks you measure which bring you down, it's the risks you don't measure. But protecting against those risks is very, very hard."

Here's my comment:

Posted: Nov 03 2008 11:28am ET
To me, there is a big difference between not knowing about risk and ignoring risk. If my rating being lowered causes me to increase my capital, and I don't know that, then I didn't know about the risk.

If, on the other hand, I know the rules, but ignore scenarios that I deem unlikely, then I'm ignoring risk.

With all due respect to the people named, it strikes me as ignoring risk. By the way, not measuring risk has to be construed as ignoring it, since, without measurement, you've no idea what the risk is at all, other than your own perception.

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