Treating the Bid/Ask spread as a Normal Distribution...

[earth_imperator]

This would be difficult to do if there is only one or two price steps between the bid and ask. Maybe you could do this for less liquid instruments, where the gap between bid and ask is a (large) multiple of the minimum price step size.

Right, this is intended for B/A spreads > ticksize.

 

[murray t turtle]

KISS.

Your bid will be filled at the market's ask... and vice versa for your sale. Unless a MM decides to play your order between the bid/ask spread, your limit bid gets filled when the market moves down so that your bid has become the market's ask.

(I understand... you want to buy at the bid and sell at the ask. Unfortunately, doesn't usually work that way.)

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LOL=if ONLY people sometimes worked for nothin'
Sometimes one can sell @ ask/ sell /exit in to a real good market uptrend , good limit order.
But that'$ only in a real good market uptrend.
Or course if market reverses then + one still wants out quick\its worse than the original bid