The problem with Occupy Wall Street, an investment banker wrote to me, is that financial mechanisms are very complicated, and the protesters don’t understand them. On the day that the New York occupation of Zuccotti Park spread to Washington Square, another visitor from the finance world looked out over the milling malcontents: “Things went wrong, but you have to understand how the system works. Looking at these signs doesn’t give me a lot of confidence.” [More . . . ]