By Ben Leubsdorf 

The gap between the richest and poorest Americans widened even as the U.S. economic recovery gained traction in the years following the recession, the Federal Reserve said Thursday.

Average, or mean, pretax income for the wealthiest 10% of U.S. families rose 10% in 2013 from 2010, but families in the bottom 40% saw their average inflation-adjusted income decline over that period, according to the Fed's Survey of Consumer Finances, which is conducted every three years.

Middle- and upper-middle-class families, in the 40th through 90th percentiles, "saw little change" in take-home pay and so "failed to recover the losses experienced between 2007 and 2010," the report said.

Overall, average income rose 4% from 2010 while median--the midpoint with half higher and half lower--income fell 5%, "consistent with increasing income concentration during this period," the report said.

The top 3% of families saw their share of U.S. income rise to 30.5% in 2013 from 27.7% in 2010. Fed economists said the data reflect a return to the economy's prerecession trend, after the income distribution narrowed during the recession when top-earning families saw their incomes fall. The top 3% had held 31.4% of all income in 2007.

Widening income inequality has gained increasing attention over the past year from economists, policy makers and the wider public amid concerns over the uneven gains of the economic recovery.

Thursday's Fed report described "substantial disparities in the evolution of income and net worth" since 2010, even as the unemployment rate fell and economic growth rebounded following the 2007-09 recession.

Fed Chairwoman Janet Yellen, during her confirmation hearing last November, called widening inequality "a very deep problem" but cautioned that "many of the underlying factors are things that are outside of the Federal Reserve's ability to address."

Average income rose last year from 2010 by 7% for homeowners, 8% for non-Hispanic whites and 5% for households headed by a person with a college degree. Average income fell 1% for renters, 11% for nonwhite and Hispanic families and 17% for households headed by someone without a high-school diploma.

The median net worth of American families tumbled 38.8% between 2007 and 2010, while the average fell 14.7%. The situation has stabilized, but families haven't regained lost ground, Thursday's report revealed. Median net worth fell 2% in 2013 from 2010, while average net worth was basically flat.

Ownership rates for most assets--from stocks to retirement accounts, cars to homes--fell from 2010 to 2013, which "indicates that while most families continue to hold some type of asset, many more families now hold fewer different types of assets," the report said. Some 65.2% of families owned their primary residence in 2013, the lowest homeownership rate since 1995.

The report also found what it described as a "mixed picture" for recent experiences with credit markets. Fewer families reported applying for credit and being turned down, but more said they had not applied at all for fear of being turned down. Fewer families reported being late on their loan payments, but more reported taking out payday loans.

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