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I think you'll find, when you try to get down into it, there's no easy way to enforce a speed limit. It's a naturally arising behaviour. You could try making a
by MichaelGG 9y ago
I think you'll find, when you try to get down into it, there's no easy way to enforce a speed limit. It's a naturally arising behaviour. You could try making a market that crosses orders every X seconds, but then you move the speed to the edge of those periods.
If you wanna slow down HFT, then kill the stupid restriction that stocks be priced in pennies. With 8 digits of resolution, HFTs would then be forced to compete on price.
- ForHackernews 9y agoThat's an interesting idea. Is that rule just a holdover from the days of manual accounting?
- consz 9y agoFrom my own conversations with exchanges -- I think this is just the exchange appealing to layman investors. The exchange wants to appear liquid, and they like to do this by having a lot of shares on the best bid or offer. If you reduce the tick sizes, you'll definitely see fewer shares on the inside bid or offer (even though you'll see more shares on the inside x% for any x, aka. you'll see more liquidity), but the layman investor (e.g. mom and pop, retail traders, people like brad katsuyama, etc.) will suddenly think you're less liquid because the best price now has fewer shares. That's, at least, the strongest argument I've heard for why tick sizes aren't reduced more rapidly.