In an efficient market at any point in time the actual price of a security will be a good estimate of its intrinsic value.
Eugene FamaActive management is a zero-sum game before cost, and the winners have to win at the expense of the losers.
Eugene FamaThe distribution of the market is fat-tailed relative to the normal distribution... For passive investors, none of this matters, beyond being aware that outlier returns are more common than would be expected if return distributions were normal.
Eugene Fama