Allan Meltzer’s article raises a lot of interesting issues. The main argument is that top one percent has increased its share of national income pretty much everywhere, and this underscores that the causes of this trend should be sought in global trends. It is true that there have been important global trends — in particular, skill-biased technological change and growing international trade — increasing the demand for skills. See for example Claudia Goldin and Larry Katz’s magnum opus on this, or this discussion of their book, or this article on technology and inequality. None of this is (very) controversial.
But Meltzer claims more than this — that these trends account for the increase in share of the top one percent in the US. This is much more controversial. First, the book on the share of the top one percent, has been written by Anthony Atkinson, Thomas Piketty and Emmanuel Saez’s careful and painstaking work, see here. They show that the US — to some degree together with the UK — stands apart from others in terms of the extent of the increase in the share of the top one percent in national income. The next chart, which uses their data, summarizes this pattern and shows that the top one percent’s share increased little or not at all in several European countries (but caution: one has to be careful about how capital income, which is not available in every country; so it is definitely useful to read their paper carefully).
Data from Anthony Atkinson, Thomas Piketty and Emmanuel Saez (source).
Second, cross-country differences are even more jarring when one looks at the bottom of the income distribution. Here is the US picture:
There seems to be no equivalent of the 40-year stagnation of median wages in Europe.
Third, it is not clear how the changes in the demand for skills explain the pay explosion for the very very rich. Have technological change and trade with China really increased the demand for the skills uniquely possessed by bond traders and Enron executives all that much?