Quote from OddTrader:
I am starting to think that a valid edge must have significant and outperforming profit expectancy (positive expectancy, of course).
Small positive expectancy (with alpha return close to 0) should not be classified as having an edge, that means claiming simply "positive expectancy is edge" could be basically wrong.
That is true. But the question of what is an edge was addressed in the other thread. Are you changing the focus of this one?