> There are professional day traders who earn an income over the long run by day trading. This is a true fact. Got anything to back up this "fact"? > The mod

> There are professional day traders who earn an income over the long run by day trading. This is a true fact. Got anything to back up this "fact"? > The model I gave was the simplest model I could think of that would let you test the theory that skill is a factor in day trading. You can't assume the existence of skill proves the existence of long-term profits. Nor can you even assume that a good up/down ratio proves skill without considering the magnitude of the ups and downs or the impact of compounding.