复利 : what date does this info come out ?

QMengColdJoke : that’s for long term. Fun part is a bubble can last 2 to 3 years before blowing up to ashes. A very profitable company can be very cheap only for a few months

Mcsnacks H Tupack OP QMengColdJoke : Not necessarily. EMH implies that active management strategies are unlikely to outperform passive strategies consistently. It discourages the pursuit of "undervalued" stocks or timing the market. Active management has excessive trading involved in it.
EMH is the driving force behind the rise of passive investing, which is long term, in for example ETF's or index funds.
EMH with high-frequency trading and algorithmic trading are thought to have made it so all efforts,long or short term, to beat the market are futile.