Just a question that popped into my head: what would happen if everyone followed a passive strategy, ie, no one was active? Isn't some sort of active strategy required, somewhere, for funds to be directed at all? Though, I do think on average fund managers probably don't actually make anything like useful predictions. But perhaps we do need someone, somewhere, looking for good investment. My guess is that there is a…
"News" is any new information that affect the expected present value of a company cashflow. It could be a new product, a possible merge or macroeconomic indicator.
If you invest in an index fund, you're basically following the trades of those value traders. You won't make as much money as them, because often you'll be buying "good" stocks after they've already increased in price, i.e., by the time passive fund managers buy the "good" stock, the price will often have already incorporated the value of the good news. The same holds for the "bad" stocks.