I am a newbie, and I would like to know the defintion of liquidity in terms that I can use in a scan in tc2000. I have read many people use volume > 500.000 or 1million, but is that enough to define liquidity? I also heard that many people use the spread, if its very small, then the stock is liquid. I am not sure if I can use spread as a filter in TC2000. but what are your thoughts?