There are lots of ways to describe money: moolah, lean green, dinero … I memorized one definition of “money” from an economic textbook way back in 1966: “A medium of exchange and a store of value,” it said. Well, yes, I suppose, although it failed miserably in the latter capacity in subsequent years. My primer also neglected to mention the increasingly dominant function that money was to assume in a finance-oriented, capitalistic system: Money can be used to make money. [...] Today the yellow brick road begins on Wall Street or the City. Aside from supernova innovators such as Steve Jobs or Mark Zuckerberg, the money is made from securitizing things instead of booting and rebuilding America. The tallest buildings in almost every major city are banks, with tens of thousands of people shuffling and trading paper for a living.