Hi everyone!

So I realize the answer to this question is most likely going to be: "however much you plan on buying or selling", but I figured I'd ask what you all have experienced in live trading.

My question is, for coarse universe selection, what do you feel is a good minimum dollar trade volume to set as a filter? I've heard that if you're too low with respect to your initial capital and your backtest will be very inaccurate, due to the fact that backtesting will never be able to capture illiquidity. Too high, and it's possible to constrain your search to mid- to- high-cap securities, thus leaving out growth stocks.

Anyone have experience in this, maybe with regards to live trading? As always, thanks for your time!