An anonymous reader writes "Financial markets experienced a series of computer glitches recently that brought operations to a halt. According to a researcher at the University of Miami, mobs of ultrafast robots, which trade and operate at speeds beyond human capability, may be responsible for these "flash freezes". From the article: '"Even though each trading algorithm/robot is out to gain a profit at the expense of any other, and hence act as a predator, any algorithm which is trading has a market impact and hence can become noticeable to other algorithms," said Neil Johnson, a professor of physics at the College of Arts and Sciences at the University of Miami (UM) and lead author of the new study. "So although they are all predators, some can then become the prey of other algorithms depending on the conditions. Just like animal predators can also fall prey to each other." When there's a normal combination of prey and predators, he says, everything is in balance. But once predators are introduced that are too fast, they create extreme events.'"