Showing posts with label tail risk. Show all posts
Showing posts with label tail risk. Show all posts

Thursday, June 11, 2009

government’s ad hoc financial engineering over the past year or so has been to shove hundreds of billions of dollars of tail risk

From Reuters:

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Felix Salmon

not short

June 11th, 2009

Rortybomb’s run-your-own-stress-test spreadsheet

Posted by: Felix Salmon
Tags: banking, regulation

Mike at Rortybomb has the blog entry of the year I think; the background is here. Essentially he’s found a Rosetta-stone like table on page 6 of the stress test results, and has used it to create a fabulous spreadsheet which allows you to plug various different unemployment rates into a cell at the top and see what kind of capital needs result.

Of course there are lots of caveats — linear extrapolations are pretty down-and-dirty things. But the upshot is startling: if unemployment does rise more than Treasury feared it might, there are still quite a lot of banks which will be able to withstand the economic downturn and require no new capital. But let’s say that a realistic adverse scenario today has unemployment at 12.2% rather than 10.3%. What happens to banks’ capital requirements?

AmEx, BoNY, Goldman, and MetLife all remain at zero. A few banks require relatively modest cash infusions: FifthThird, for instance, sees its hole grow from $1.1 billion to $4.9 billion. JP Morgan requires $39 billion, which is probably doable; Morgan Stanley needs $15.6 billion, which might be a stretch. But look at Bank of America: rather than needing $33.9 billion, it suddenly needs to raise over $100 billion. In fact, BofA alone accounts for more than 25% of all the excess capital needs under this exercise.

Says Mike:

It really seems if you go out a bit all the losses are with a few specific banks, and maybe we should look into breaking them up before they become even more of a rotting albatross on our economy’s neck…

I was actually surprised – I assume turning up the numbers a bit would cause everyting to start leaking red ink. Instead it seems that if there is an additional slight downturn in the economy, we know the firms that will have all the problems. They are the ones that are too big to fail.

It seems that the result of the government’s ad hoc financial engineering over the past year or so has been to shove hundreds of billions of dollars of tail risk into a handful of enormous banking institutions. Which isn’t reassuring at all."

Me:

The Stress Tests, like all government actions, create their own reality. By that, I mean to say that govt statistics, plans, etc., are intended to be real, but also useful. That’s why some less precise measures are often used by the govt. It’s easier for the govt to make use of them.

I’m glad that Mike has run his own stress test, but Mike’s not the govt.

“It seems that the result of the government’s ad hoc financial engineering over the past year or so has been to shove hundreds of billions of dollars of tail risk into a handful of enormous banking institutions. Which isn’t reassuring at all.”

I’m sure that it would have been better for the govt to say that. Pure FDR. Let’s all scream together. Look, we know that things could bad. These are projections. But when the govt says it, oddly, they carry more weight. There comes a point when worrying about tail risk becomes millenarian.

- Posted by Don the libertarian Democrat

Thursday, June 4, 2009

Insurance companies cannot be required to have reserves (or reinsurance backed by reserves) against risks that cannot be estimated

From The Atlantic:

Jun 3 2009, 3:41PM

"Tail Risk," Economists' Predictions, and Credit-Default Swaps

There is much criticism of the banking industry for having failed to take account of "tail risk." The reference is to parts of the normal distribution and of variants such as the student t distribution. These probability distributions form a bell-shaped curve. The ends of the bell, or "tails" of the distribution as they are called, denote very small probabilities. If the mean of a normal distribution is 500 and the standard deviation from the mean is 100, then 99.7 percent of the observations comprising the distribution will fall between 200 and 800, and hence fewer than one-third of one percent of them will be smaller than 200 or larger than 800.

The probability, say in 2005, that there was a nationwide housing bubble that would burst and drive the banking industry into a condition of near insolvency (indeed, without the bailouts, the banking industry might have been insolvent) was small--a "tail risk." And we are told that the industry was "reckless" to fail to take precautions against such a risk.

Yet recently a distinguished macroeconomist at Northwestern University, Robert Gordon, has predicted that the current depression will bottom out either this month or next, without worrying about tails. On May 1 he wrote that he had

discovered a surprisingly tight historical relationship in past US recessions between the cyclical peak in new claims for unemployment insurance (measured as a four-week moving average) and the subsequent...trough...It is always too early to make definitive conclusions, but the recent 2009 peak in new claims looks sufficiently similar to previous recession peaks to allow a conclusion that it is highly probable that the new claims peak has now occurred...My reasoning leads me to conclude that the ultimate...trough of the current business cycle is likely to occur in May or June 2009, substantially earlier than is currently predicted by many professional forecasters.

His prediction is based entirely on past data. It is an exercise in induction. It therefore assumes that the future will be like the past. Maybe so. But there is a "tail risk" that the future will not repeat the past, and he makes no effort to estimate it. How could he? History is not a normal distribution.

Just to speak of "tail risks" is to prejudice a sensible assessment of the bankers' behavior leading up to the crash. The idea of statistical "tails" is associated with the normal (or closely related) distributions, in which tail risk is a quantitative probability, as in my earlier example. The risk of an economic collapse, like the risk of a terrorist attack or of an attempt to assassinate the Pope, cannot be quantified. It belongs to the realm of uncertainty, when "uncertainty" is used to denote a risk that is not calculable.

As Keynes famously wrote, the "urge to action" induces businessmen to take noncalculable risks. It induced Professor Gordon to predict when our current economic downturn will reach its nadir. And it motivated, and motivates, risky lending.

Which brings me to the criticism of American Insurance Group and other issuers of credit-default swaps for having failed to maintain adequate (in A.I.G.'s case any) reserves. Credit-default swaps are unregulated insurance contracts, insuring businesses against losses due to defaults. When the international banking system collapsed last September, the number of defaults exceeded the ability of A.I.G. to honor its obligations, and the government bailed it out, to the tune, eventually, of almost $200 billiion. The credit-default swap market as a whole, however, functioned throughout the crisis quite well.

Should A.I.G. have had reserves? Probably. But they would have been overwhelmed by the financial crisis. Insurance companies cannot be required to have reserves (or reinsurance backed by reserves) against risks that cannot be estimated and if they materialized would cause a global depression or some equivalent catastrophe. If a nuclear attack killed 50 million Americans, the entire life insurance industry would be bankrupt, but the industry would not be criticized for having failed to maintain adequate reserves against such an eventuality.

The responsibility for preventing, or remedying, disasters that transcend the capabilities of the private market is a governmental responsibility, which our government failed to discharge. I continue to be perplexed by how government has managed to escape most of the blame for our current economic state."

Me:

Don the libertarian Democrat

"The responsibility for preventing, or remedying, disasters that transcend the capabilities of the private market is a governmental responsibility, which our government failed to discharge. I continue to be perplexed by how government has managed to escape most of the blame for our current economic state."

I basically agree with you. However, the government is getting plenty of blame. It's just that it's diffused among Greenspan, the SEC, Sheila Bair, Bernanke, Paulson, Congress, Basel II, etc. And, even among people who agree that Lehman could and should have been saved, there's disagreement about what should have been done. Since I was afraid of a Calling Run leading to a Debt-Deflationary Spiral, I believe that the government needed to, in essence, guarantee everything, just as Geithner wanted. It's hard explaining that the purpose of this would have been to keep the government from actually have to intervene and spend as much money as we have so far.

Also, you want to blame the Fed for not stopping the housing bubble, while I would say that, although that could have worked, there were a number of other governmental steps that we could have taken to stop it, that would have worked better. So government is getting plenty of blame, just not the blame that you assign to it.