" For example, trading in S&P 500-linked futures totaled more than $60 trillion(!) in 2011, five times the S&P 500 Index total market capitalization of $12.5 trillion. We also have credit default swaps, which are essentially bets on whether a corporation can meet the interest payments on its bonds. These credit default swaps alone had a notional value of $33 trillion. Add to this total a slew of other derivatives, whose notional value as 2012 began totaled a cool $708 trillion. By contrast, for what it’s worth, the aggregate capitalization of the world’s stock and bond markets is about $150 trillion, less than one-fourth as much. Is this a great financial system . . . or what! "

― John C. Bogle , The Clash of the Cultures: Investment vs. Speculation