[RobertKohr]

So if you remove the restriction on subpenny increments, you remove the need for HFT?

[RickHull]

HFT would still serve a role with subpenny increments. Nonetheless, the subpenny rule is a very important mechanic in the construction of HFT.

[AndrewHampton]

I agree. I think there is currently a balance to be struck between accuracy of the price determined by the algorithm and the speed at which it obtains that price. I think removing the subpenny rule would just reduce the importance of speed and increase the importance of accuracy. I'd imagine trades would still happen extremely fast though.