I think money management is not an edge, but is a requirement.
I think this comment would be more appropriate in thread How Do You Get Paid to Lose Someone Else's Money...Quote from psytrade:
You don't need money management, you need you're money to be managed.
Quote from Scataphagos:
No. The only genuine edges are (1) front-running and (2) insider information... both illegal.
Quote from blackjack007:
an edge makes you profitable. good money management helps you keep your profits.
without an edge you'd never become profitable to begin with. without good money management, you'd eventually lose everything you made.
they are different things; however, you need both because they're equally important.
Quote from intradaybill:
If your win rate and your profit factor do not result in a positive expectation then money management alone can do nothing to change that. However, certain forms of money management can affect the expectation. Inappropriate money managament can also cause ruin regardless of positive expectation. Thus, effective trading needs both, first a positive expectation and then good money management. Each is necessary but not sufficient. Both together are sufficient for consistent returns.