Wild Wall Streets Computer Trading
In the past few days, the stock markets have whipsawed up and down by as much as 800 points, sometimes during the same day! It can be hard to put a finger on what is driving the stock market when the behavior seems so irrational, but the reality is actually pretty easy to understand. The computer programs have been tightened, and they keep firing off, sometimes together, sometimes opposed, and each movement they create triggers another program, which triggers another program, and so on. Program Trading Once upon a time, computer trading was nothing more that the pre-placed buy and sell orders entered by traders. A stop order to sell if the price dropped below a certain amount. A buy order if the price trended up. Those trades have been replaced by more sophisticated programs run by everyone from big Wall Street banks and brokers, to hedge funds, to so-called quant mutual funds. These programs fire off hundreds, or even thousands of orders in response to pre-defined market triggers. Is there a Credit Karma scam? Get the markets leaning too far, and they start kicking in, often triggering other programs in the process. The result is seemingly bizarre trading patterns, …