From the documentary "Floored", it seems many floor traders have problems transiting profitably to electronic trading. Anyone who used to be a floor trader or know of people who were floor traders? One guess I make is that these human floor traders used to be the kings of short-term trading. With the coming of the machines, they lost the edge permanently. Still, it puzzles me why so many can't make the transition. With decades of experience in floor trading, these floor traders not only survive but prospered. The basic rules of trading should be ingrained in them by then. It should not be too hard for these battle-hardened floor traders to make the transit to electronic trading. Yet, many of them failed. It will be interesting to know why because this is what happens to profitable traders who lost their edge and cannot regain it. It can happen to any of us.