In thinking about the possible extent of the current economic crisis, I have been focused on understanding the role of debt. I first started looking at household debt. The Federal Reserve publishes statistics called the “Flow of Funds” which track sources and uses of capital in the economy over time. The following chart shows household debt, broken down into consumer debt (credit cards) and home mortgages, starting in 1966. The chart shows an eye-popping explosion in debt from a few hundred b...