The Wizard of Wall Street are at it Again!

I was horrified to read that no lessons have been learned from the recent stock market crash. (Funny, I just did a post where a right wing ideologue that free markets are better than regulated markets because they "learn their lessons". And now I have a counterexample. Within six months of the crash!)

From an op-ed piece in the NY Times by Paul Wilmott:

ON vacation in Turkey, I am picked up at the airport by a minibus. It’s past midnight, pitch-black, the driver is speeding around corners. Only one headlight is working. And I have my doubts about the brakes. In my head I’m planning the letter of complaint to the tour company. And then the driver’s cellphone rings, he picks it up and answers it, he has only one hand on the steering wheel. Now I’m mentally compiling the list of songs to be played at my funeral.

That’s rather how I feel when people talk about the latest fashion among investment banks and hedge funds: high-frequency algorithmic trading. On top of an already dangerously influential and morally suspect financial minefield is now being added the unthinking power of the machine.

The idea is straightforward: Computers take information — primarily “real-time” share prices — and try to predict the next twitch in the stock market. Using an algorithmic formula, the computers can buy and sell stocks within fractions of seconds, with the bank or fund making a tiny profit on the blip of price change of each share.

There’s nothing new in using all publicly available information to help you trade; what’s novel is the quantity of data available, the lightning speed at which it is analyzed and the short time that positions are held.

You will hear people talking about “latency,” which means the delay between a trading signal being given and the trade being made. Low latency — high speed — is what banks and funds are looking for. Yes, we really are talking about shaving off the milliseconds that it takes light to travel along an optical cable.

So, is trading faster than any human can react truly worrisome? The answers that come back from high-frequency proponents, also rather too quickly, are “No, we are adding liquidity to the market” or “It’s perfectly safe and it speeds up price discovery.” In other words, the traders say, the practice makes it easier for stocks to be bought and sold quickly across exchanges, and it more efficiently sets the value of shares.

...

It has been said that the October 1987 stock market crash was caused in part by something called dynamic portfolio insurance, another approach based on algorithms. Dynamic portfolio insurance is a way of protecting your portfolio of shares so that if the market falls you can limit your losses to an amount you stipulate in advance. As the market falls, you sell some shares. By the time the market falls by a certain amount, you will have closed all your positions so that you can lose no more money.

...

By 1987, however, the problem was the sheer number of people following the strategy and the market share that they collectively controlled. If a fall in the market leads to people selling according to some formula, and if there are enough of these people following the same algorithm, then it will lead to a further fall in the market, and a further wave of selling, and so on — until the Standard & Poor’s 500 index loses over 20 percent of its value in single day: Oct. 19, Black Monday. Dynamic portfolio insurance caused the very thing it was designed to protect against.

This is the sort of feedback that occurs between a popular strategy and the underlying market, with a long-lasting effect on the broader economy. A rise in price begets a rise. (Think bubbles.) And a fall begets a fall. (Think crashes.) Volatility rises and the market is destabilized. All that’s needed is for a large number of people to be following the same type of strategy. And if we’ve learned only one lesson from the recent financial crisis it is that people do like to copy each other when they see a profitable idea.

...

Thus the problem with the sudden popularity of high-frequency trading is that it may increasingly destabilize the market. Hedge funds won’t necessarily care whether the increased volatility causes stocks to rise or fall, as long as they can get in and out quickly with a profit. But the rest of the economy will care.

Buying stocks used to be about long-term value, doing your research and finding the company that you thought had good prospects. Maybe it had a product that you liked the look of, or perhaps a solid management team. Increasingly such real value is becoming irrelevant. The contest is now between the machines — and they’re playing games with real businesses and real people.

I'm 100% behind Wilmott. This claim that machines can safely trade was shown false in the 1987 crash which was proportionally more severe than the 1929 crash.

In short, Wall Street brainiacs keep coming up with "sure thing" approaches where they don't understand the consequences of their own "innovations". They inflict them on the rest of us since crashes on Wall Street quickly devolve into crashes on Main Street. This is precisely why there is a need for financial regulation!