SEC approves IEX as national stock exchange

The U.S. Securities and Exchange Commission has granted the hotly debated request by alternative trading group IEX Group Inc to launch a new U.S. public stock exchange, a move likely to intensify arguments over current market structure. IEX, made famous by Michael Lewis' 2014 book "Flash Boys: A Wall Street Revolt," is notable because it would be the only exchange in the United States to include a so-called speed bump - a 350 millionths-of-a-second delay in all incoming and outcoming orders. Oth