为自营交易辩护者，不说它能给银行带来巨额利润（这一块利润的确丰厚 ） ， 而是说它有做市功能，能够为那些罕有人交易的金融工具提供流动性。
Proprietary trading was justified not because it created large profits for banks (it did), but because it was supposed to create markets and provide liquidity for rarely traded instruments.