There is an old joke in the banking industry, told and retold at cocktail parties and conferences, about the “3-6-3 plan.” It goes something like this: bankers should pay depositors a 3 percent interest rate, issue loans at 6 percent, and head to the golf course by 3 o’clock. The joke now comes with a whiff of nostalgia for the old days of banking, in which financial intermediation was viewed as a relatively boring industry that provided simple financing for customers and predictable middle-class careers for bankers.