Money makes the world go around.  But what sort of thing is money?  Bits of paper and metal?  An elaborate set of IOUs to be redeemed with more IOUs?  An abstract accounting tool?  If money is real, how can billions disappear on the stock market?  And where does it go?  Ken and John follow the money – its nature, its utility, and whether it is the root of all evil – with Stanford Economist Alex Gould.