[reverend_gonzo]

What's your point?

That shows that volume increased. Which means higher competition between market makers resulting in smaller bid-ask spreads and higher liquidity, meaning the market can correct itself much faster.

[nlz1]

You're naive or outright lying if you think that all HFT firms are simply doing what earlier generations of traders did, just "faster."

http://www.nanex.net/aqck2/3528.html