A few of the report’s key findings:

• Almost 50 million people in the U.S. are poor using the supplemental measure, compared to the 47 million using the official measure.
• Food stamps (formally known as SNAP) keep about five million people out of poverty, according to the supplemental measure.
• Without Social Security more than half of all Americans 65 and over would be in poverty. (Both supplemental and traditional poverty measures include Social Security benefits.)
• Under the supplemental measure, which includes cost-of-living differences, poverty is much higher in expensive states like California and New York, and lower in places like Alabama and Kentucky.
• The poverty rate for children goes down under the supplemental measure and it goes up for those 65 and older. That’s because the supplemental measure includes the impact of out-of-pocket medical expenses (which are high for senior citizens) and of certain government benefits that go disproportionately to children.

Sara Kimberlin, author of the Berkeley study, used the supplemental poverty measure to look at poverty over an 11-year period. She found that chronic poverty — those who were poor for more than half that time — was lower than previously thought. Only about two percent of people were chronically poor under the supplemental measure, compared with 3.3 percent under the official rate.

This is important, because research shows that chronic poverty does the most long-term harm to people, especially children.

Kimberlin says most people in poverty are poor for a short period of time, because government benefits help lift them back above the poverty line. And it’s only a big setback — like a job loss or unexpected medical bill — that pulls them back down.

The supplemental measure “makes it easier to think about solutions,” Kimberlin says, because you can get an idea which programs are doing the most good.

Source:http://www.npr.org