I don't have much experience in the market, but "invest in index funds" seems like a way to inflate the values of all the companies in the index fund, deserved or not, and I find it worrying that it's touted as an easy/simple way to make money. If there's a lot more index fund money than hedge fund / active money it would probably mess with prices, right? Is there any good analysis of when it would stop making sense to invest in an index fund? Or ways to weight certain companies higher or lower in a 'personal' index fund?