And when men live by trade--with reason, not force, as their final arbiter--it is the best product that wins, the best performance, the man of best judgment and highest ability--and the degree of a man's productiveness is the degree of his reward. This is the code of existence whose tool and symbol is money. Is this what you consider evil?
Source: Francisco d'Anconia’s Speech, Atlas Shrugged, by Ayn Rand, p.388