60 Minutes last night ran a piece about high-frequency tradingthat piled onto doubts about such computer-driven rapid trades and whether they are an unfair gaming of the markets.

These super computers, which actually decide which stocks to buy and sell, are operating on highly secret instructions programmed into them by math wizards who may or may not know anything about the value of the companies that are being traded, correspondent Steve Kroft said in the opener.

The...