Sabtu, 15 Mei 2010

Creating more risk by trying to manage risk

Securitization was an attempt at managing risk. There have been a number of attempts to mitigate risk, or insure against problems. While these are legitimate things to do, the instruments that allowed this to happen helped cause the current problems, too.
In essence, what had happened was that banks, hedge funds and others had become over-confident as they all thought they had figured out how to take on risk and make money more effectively. As they initially made more money taking more risks, they reinforced their own view that they had it figured out. They thought they had spread all their risks effectively and yet when it really went wrong, it all went wrong.

In a follow-up documentary, Davis interviewed Naseem Taleb, once an options trader himself, who argued that many hedge fund managers and bankers fool themselves into thinking they are safe and on high ground. It was a result of a system heavily grounded in bad theories, bad statistics, misunderstanding of probability and, ultimately, greed, he said
What allowed this to happen? As Davis explained, a look for way to manage, or insure against, risk actually led to the rise of instruments that accelerated problems:
Derivatives, financial futures, credit default swaps, and related instruments came out of the turmoil from the 1970s. The oil shock, the double-digit inflation in the US, and a drop of 50% in the US stock market made businesses look harder for ways to manage risk and insure themselves more effectively.
The finance industry flourished as more people started looking into how to insure against the downsides when investing in something. To find out how to price this insurance, economists came up with options, a derivative that gives you the right to buy something in the future at a price agreed now. Mathematical and economic geniuses believed they had come up with a formula of how to price an option, the Black-Scholes model.
This was a hit; once options could be priced, it became easier to trade. A whole new market in risk was born. Combined with the growth of telecoms and computing, the derivatives market exploded making buying and selling of risk on the open market possible in ways never seen before.
As people became successful quickly, they used derivatives not to reduce their risk, but to take on more risk to make more money. Greed started to kick in. Businesses started to go into areas that was not necessarily part of their underlying business.
In effect, people were making more bets — speculating. Or gambling.
Hedge funds, credit default swaps, can be legitimate instruments when trying to insure against whether someone will default or not, but the problem came about when the market became more speculative in nature.
Some institutions were paying for risk on margin so you didn’t have to lay down the actual full values in advance, allowing people to make big profits (and big losses) with little capital. As Nick Leeson (of the famous Barings Bank collapse) explained in the same documentary, each loss resulted in more betting and more risk taking hoping to recoup the earlier losses, much like gambling. Derivatives caused the destruction of that bank.
Hedge funds have received a lot of criticism for betting on things going badly. In the recent crisis they were criticized for shorting on banks, driving down their prices. Some countries temporarily banned shorting on banks. In some regards, hedge funds may have been signaling an underlying weakness with banks, which were encouraging borrowing beyond people’s means. On the other hand the more it continued the more they could profit.
The market for credit default swaps market (a derivative on insurance on when a business defaults), for example, was enormous, exceeding the entire world economic output of $50 trillion by summer 2008. It was also poorly regulated. The world’s largest insurance and financial services company, AIG alone had credit default swaps of around $400 billion at that time. A lot of exposure with little regulation. Furthermore, many of AIGs credit default swaps were on mortgages, which of course went downhill, and so did AIG.
The trade in these swaps created a whole web of interlinked dependencies; a chain only as strong as the weakest link. Any problem, such as risk or actual significant loss could spread quickly. Hence the eventual bailout (now some $150bn) of AIG by the US government to prevent them failing.
Derivatives didn’t cause this financial meltdown but they did accelerate it once the subprime mortgage collapsed, because of the interlinked investments. Derivatives revolutionized the financial markets and will likely be here to stay because there is such a demand for insurance and mitigating risk. The challenge now, Davis summarized, is to reign in the wilder excesses of derivatives to avoid those incredibly expensive disasters and prevent more AIGs happening.
This will be very hard to do. Despite the benefits of a market system, as all have admitted for many years, it is far from perfect. Amongst other things, experts such as economists and psychologists say that markets suffer from a few human frailties, such as confirmation bias (always looking for facts that support your view, rather than just facts) and superiority bias (the belief that one is better than the others, or better than the average and can make good decisions all the time). Trying to reign in these facets of human nature seems like a tall order and in the meanwhile the costs are skyrocketing.

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