But, in any case - Krugman's NYT magazine article is interesting and, thankfully, so long that it'll keep the Fiskers busy for days...
In the middle of the 1980's, as economists became aware that something important was happening to the distribution of income in America, they formulated three main hypotheses about its causes.
The ''globalization'' hypothesis tied America's changing income distribution to the growth of world trade, and especially the growing imports of manufactured goods from the third world. Its basic message was that blue-collar workers -- the sort of people who in my youth often made as much money as college-educated middle managers -- were losing ground in the face of competition from low-wage workers in Asia. A result was stagnation or decline in the wages of ordinary people, with a growing share of national income going to the highly educated.
A second hypothesis, ''skill-biased technological change,'' situated the cause of growing inequality not in foreign trade but in domestic innovation. The torrid pace of progress in information technology, so the story went, had increased the demand for the highly skilled and educated. And so the income distribution increasingly favored brains rather than brawn.
Finally, the ''superstar'' hypothesis -- named by the Chicago economist Sherwin Rosen -- offered a variant on the technological story. It argued that modern technologies of communication often turn competition into a tournament in which the winner is richly rewarded, while the runners-up get far less. The classic example -- which gives the theory its name -- is the entertainment business. As Rosen pointed out, in bygone days there were hundreds of comedians making a modest living at live shows in the borscht belt and other places. Now they are mostly gone; what is left is a handful of superstar TV comedians.
The debates among these hypotheses -- particularly the debate between those who attributed growing inequality to globalization and those who attributed it to technology -- were many and bitter. I was a participant in those debates myself. But I won't dwell on them, because in the last few years there has been a growing sense among economists that none of these hypotheses work.
I don't mean to say that there was nothing to these stories. Yet as more evidence has accumulated, each of the hypotheses has seemed increasingly inadequate. Globalization can explain part of the relative decline in blue-collar wages, but it can't explain the 2,500 percent rise in C.E.O. incomes. Technology may explain why the salary premium associated with a college education has risen, but it's hard to match up with the huge increase in inequality among the college-educated, with little progress for many but gigantic gains at the top. The superstar theory works for Jay Leno, but not for the thousands of people who have become awesomely rich without going on TV.
*He always bristles when called a conservative. It's kinda cute.