[jwie]

Orders should have some durability and it would probably change behaviors enough to make hft go away.

If you list a buy or sell order it just has to be in force for some period of time, say a minute or something.

HFT shops will say this would reduce liquidity, but it would only make clear what real liquidity was in the first place.

[smabie]

If orders has to been good for atleast a minute it would massively increase the spread (by like over a 1000x probably)

Also, what's wrong with hft?

[rfoo]

Will you put an order 1 minutes before financial statements, then? If so, at what price?

If no, knowing that there will be no liquidity in the very last minute before financial statements, will you put an order 2 minutes before?

This won't propagate forever, but is going to bring very complicated changes.

[tourist2d]

Why would anyone want that? Everyone would just quote a lot wider to make up for the potential volatility of the next minute, probably leading to worse trades for retail orders.