Quote from OddTrader:
'You can't win without an edge, even with the world's greatest discipline and money management skills. ... If you don't have an edge, all that money management and discipline will do for you is guarantee that you will gradually bleed to death. Incidently, if you don't know what your edge is, you don't have one." --- (New Market Wizards, page 463)
"Good money management alone is not going to increaese your edge at all." --- (NMW, Page 175)
Who are you going to believe?

"A trading edge is the easiest thing?"
http://elitetrader.com/vb/showthread.php?s=&postid=2478826#post2478826
Quote from Buy1Sell2:
Folks, the edge IS the asset allocation and risk management. That is the only edge in trading