The American middle class, long the most affluent in the world, has lost that distinction.
While the wealthiest Americans are outpacing many of their global peers, a New York Times analysis shows that across the lower- and middle-income tiers, citizens of other advanced countries have received considerably larger raises over the last three decades.
After-tax middle class incomes in Canada, substantially behind in 2000, now appear to be higher than in the United States. The poor in much of Europe earn more than poor Americans.
The numbers, based on surveys conducted over the past 35 years, offer some of the most detailed publicly available comparisons for different income groups in different countries over time. They suggest that most American families are paying a steep price for high and rising income inequality.
Although U.S. economic growth continues to be as strong as in many other countries, or stronger, a small percentage of U.S. households is fully benefiting from it. Median income in Canada pulled into a tie with median U.S. income in 2010 and has most likely surpassed it since then. Median incomes in Western European countries still trail those in the United States, but the gap in several -- including Britain, the Netherlands and Sweden -- is much smaller than it was a decade ago.
In European countries hit hardest by recent financial crises, such as Greece and Portugal, incomes have, of course, fallen sharply in recent years.
The income data were compiled by LIS, a group that maintains the Luxembourg Income Study Database. The numbers were analyzed by researchers at LIS and by The Upshot, a New York Times website covering policy and politics, and reviewed by outside academic economists.
The struggles of the poor in the United States are even starker than those of the middle class. A family at the 20th percentile of the income distribution in this country makes significantly less money than a similar family in Canada, Sweden, Norway, Finland or the Netherlands. Thirty-five years ago, the reverse was true.
LIS counts after-tax cash income from salaries, interest and stock dividends, among other sources, as well as direct government benefits such as tax credits.
The findings are striking because the most commonly cited economic statistics -- such as per capita gross domestic product -- continue to show that the United States has maintained its lead as the world's richest large nation. But those numbers are averages, which do not capture the distribution of income. With a big share of recent income gains in this country flowing to a relatively small slice of high-earning households, most Americans are not keeping pace with their counterparts around the world.
"The idea that the median American has so much more income than the middle class in all other parts of the world is not true these days," said Harvard economist Lawrence Katz,who is not associated with LIS. "In 1960, we were massively richer than anyone else. In 1980, we were richer. In the 1990s, we were still richer." That is no longer the case, he said.
Median per capita income was $18,700 in the United States in 2010 (which translates to about $75,000 for a family of four after taxes), up 20 percent since 1980 but virtually unchanged since 2000, after adjusting for inflation. The same measure, by comparison, rose about 20 percent in Britain between 2000 and 2010 and 14 percent in the Netherlands. Median income also rose 20 percent in Canada between 2000 and 2010, to the equivalent of $18,700.
The most recent year in the LIS analysis is 2010. But other income surveys, conducted by government agencies, suggest that since 2010, pay in Canada has risen faster than pay in the United States and is now most likely higher. Pay in several European nations has also risen faster since 2010 than it has in the United States.
LIS director Janet Gornick noted that inequality in so-called market incomes -- which does not count taxes or government benefits -- "is high but not off the charts in the United States." Yet the American rich pay lower taxes than the rich in many other places, and the United States does not redistribute as much income to the poor, as other countries do. As a result, inequality in disposable income is sharply higher in the United States than elsewhere.
The income stagnation has left many Americans dissatisfied with the state of the nation. Only about 30 percent of people believe that the country is headed in the right direction, polls show.