NPR is out today with a story about a new analysis of government data that shows where people who grew up in a low-income environment are more likely to make good.

A new online data tool being made public Monday finds a strong correlation between where people are raised and their chances of achieving the American dream.

Harvard University economist Raj Chetty has been working with a team of researchers on this tool — the first of its kind because it marries U.S. Census Bureau data with data from the Internal Revenue Service. And the findings are changing how researchers think about economic mobility.

It used to be that people born in the 1940s or '50s were virtually guaranteed to achieve the American dream of earning more than your parents did, Chetty says. But that's not the case anymore.

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