The Securities and Exchange Commission (SEC) knows that High-Frequency Trading (HFT) manipulates the market and bilks investors out of tens of billions of dollars every year. But SEC chairman Mary Schapiro refuses to step in and take action. Instead, she's concocted an elaborate "information gathering" scheme, that does nothing to address the main problem. Schapiro's plan--to track large blocks of trades by large institutional investors-- is an attempt to placate congress while the big Wall Street HFT traders to continue to rake in obscene profits. It achieves nothing, except provide the cover Schapiro needs to avoid doing her job.
High-frequency trading (HFT) is algorithmic-computer trading that finds "statistical patterns and pricing anomalies" by scanning the various stock exchanges. It's high-speed robo-trading that oftentimes executes orders without human intervention. But don't be confused by all the glitzy "state-of-the-art" hype. HFT is not a way of "allocating capital more efficiently", but of ripping people off in broad daylight.