Essentially it means you can’t make money, without one of the following (1) luck or (2) non-public information. Now, to be precise, the phrase “you can’t make any money” really means, “you will not consistently achieve risk-adjusted above market returns.” And by “you” I do mean YOU, whether you’re a Harvard undergrad day-trading in your dorm, a retiree with a 401K, or you’re running a $10 billion mutual fund or hedge fund.
4 thoughts on “What does it mean for a market to be efficient?”
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