Comment by brosephius

Wouldn't this cause spreads on stocks to get very wide? Liquid stocks are a penny wide now, I could see that going up to five or ten cents with such a tax. While the average investor isn't going to get hit much, in aggregate it seems like it could cost average investors billions. I'm not saying that's worse than what HFT allegedly costs, but just a point of comparison. Not that I'd expect this tax to get enacted anyway.