.... in the last two weeks, the New York attorney general and the Commodities Futures Trading Commission in Washington have both launched investigations into high-frequency computerized stock trading that now controls more than half the market.

The probes were announced just ahead of a much anticipated book on the subject by best-selling author Michael Lewis called "Flash Boys." In it, Lewis argues that the stock market is now rigged to benefit a group of insiders that have made tens of billions of dollars exploiting computerized trading.  ...