老生常谈是，由于后续成本存在，普通投资者无法击败市场。研究机构由此得出观点，明显的击败市场的机会将很快会被套利耗尽。
From the truism that the average investor could not beat the market after costs, academics developed the insight that obvious market-beating opportunities would quickly be arbitraged away.
这将给那些做了研究的投资者一个获得真正利润的机会，假如他们能够将承诺的增长与实际的利润增长区别开来。
That will give investors who do their homework a chance to make real profits if they can separate actual profitable growth from the promise of growth.
这将给那些做了研究的投资者一个获得真正利润的机会，假如他们能够将承诺的增长与实际的利润增长区别开来。
That will give investors who do their homework a chance to make real profits if they can separate actual profitable growth from the promise of growth.
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