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"Every day, the markets were driven less directly by human beings and more directly by machines. The machines were overseen by people, of course, but few of them knew how the machines worked. He knew that RBC's machines--not the computers themselves, but the instructions to run them--were third-rate, but he had assumed it was because the company's new electronic trading unit was bumbling and inept. As he interviewed people from the major banks on Wall Street, he came to realize that they had more in common with RBC than he had supposed. "I'd always been a trader," he said. "And as a trader you're kind of inside a bubble. You're just watching your screens all day. Now I stepped back and for the first time started to watch other traders." He had a good friend who traded stocks at a big-time hedge fund in Stamford, Connecticut, called SAC Capital. SAC Capital was famous (and soon to be infamous) for being one step ahead of the U.S. stock market. If anyone was going to know something about the market that Brad didn't know, he figured, it would be them. One spring morning he took the train up to Stamford and spent the day watching his friend trade. Right away he saw that, even though his friend was using technology given to him by Goldman Sachs and Morgan Stanley and the other big firms, he was experiencing exactly the same problem as RBC: The market on his screens was no longer the market. His friend would hit a button to buy or sell a stock and the market would move away from him. "When I see this guy trading and he was getting screwed--I now see that it isn't just me. My frustration is the market's frustration. And I was like, Whoa, this is serious." Brad's problem wasn't just Brad's problem. What people saw when they looked at the U.S. stock market--the numbers on the screens of the professional traders, the ticker tape running across the bottom of the CNBC screen--was an illusion. "That's when I realized the markets are rigged. And I knew it had to do with the technology. That the answer lay beneath the surface of the technology. I had absolutely no idea where. But that's when the lightbulb went off that the only way I'm going to find out what's going on is if I go beneath the surface."