josh's clients aren't stupid, they're smart

I highly recommend John Bogle's books, including "Enough" and "Don't Count on It". He's been a professional investor since the 1950's, founded Vanguard, and those books I've read include graphs & numbers illustrating his points. Main point - trying to outguess the market is a loser's game (at best over the long term you match the market, but when disintermediation is taken into account, you lose money). Over the long term, most money managers make lots of money on transaction fees, but their customers lose.

Another good book is "The Black Swan" by Nassim Nicholas Taleb.