The prospects of upward mobility for Americans is waning, warned a report issued Tuesday by the International Monetary Fund.

The group put the blame on technological changes, low productivity growth, smaller income increases for higher skills, and an aging population.

“Household incomes are stagnating for a large share of the population (in inflation-adjusted terms, more than half of U.S. households has a lower income today than they did in 2000),” said the study.

While job growth since the meltdown has put the U.S. at full employment, the IMF said the nation’s 13.5 percent poverty rate is one of the highest among advanced nations.

The international consortium lambasted the recovery since the 2008 recession as “too low and too unequal.”

As a cure, the IMF recommended a mix of improving the efficiency of the tax system, improving education and developing skills, reprioritizing federal spending, improving the effectiveness of the regulatory system, and reforming the immigration and welfare systems.

“The right policy package represents an upside risk to growth and would serve to ensure a broad-based improvement in living standards,” the study concluded.