Nick Hanauer, a 0.1%-er on taxing the rich... his whole op/ed is worth a look, but here's the best quote, which helps explain why top-heavy societies don't work:
Since 1980, the share of the nation's income for fat cats like me... has increased a shocking 400 percent, while the share for the bottom 50 percent of Americans has declined 33 percent. At the same time, effective tax rates on the superwealthy fell to 16.6 percent in 2007... In my case, that means that this year, I paid an 11 percent rate on an eight-figure income.
One reason this policy is so wrong-headed is that there can never be enough super-rich Americans to power a great economy. The annual earnings of people like me are hundreds, if not thousands, of times greater than those of the average American, but we don't buy hundreds or thousands of times more stuff. My family owns three cars, not 3,000. I buy a few pairs of pants and a few shirts a year, just like most American men. Like everyone else, I go out to eat with friends and family only occasionally.
If the average American family still got the same share of income they earned in 1980, they would have an astounding $13,000 more in their pockets a year. It’s worth pausing to consider what our economy would be like today if middle-class consumers had that additional income to spend.