Many of us have been struck by the huge increase in income inequality in the United States in the past thirty years. The rich have gotten much richer, while just about everyone else has had very modest income growth.
Some dismiss inequality and focus instead on overall growth — arguing, in effect, that a rising tide lifts all boats. But assume we have a thousand boats representing all the households in the United States, with boat length proportional to family income. In the late 1970s, the average boat was a 12 foot canoe and the biggest yacht was 250 feet long. Thirty years later, the average boat is a slightly roomier 15 footer, while the biggest yacht, at over 1,100 feet, would dwarf the Titanic! When a handful of yachts become ocean liners while the rest remain lowly canoes, something is seriously amiss.
In fact, inequality matters. And it matters in all corners of the globe. You need look no further than the role it might have played in the historic transformation underway in the Middle East.
The increase in U.S. income inequality in recent decades is strikingly similar to the increase in the 1920s. In both cases there was a boom in the financial sector, poor people borrowed a lot, and it all ended in huge financial crises. Did the recent financial crisis result somehow from the incr