Every extra year you spend in a better environment makes you more likely to go to college, less likely to have a teenage pregnancy, makes you earn more as an adult, makes you more likely to have a stable family situation, be married, for instance, when you're an adult.

The latest research on social mobility showed that there's a large aggregate decline in the U.S. in your chances of earning more than your parents. But I think where the story becomes more optimistic one is that there are pockets of America, where children from low-income families have significant chances of rising up in the income distribution. This finding of big geographic variation is an encouraging one because it shows that there are places where we see the American Dream thriving and we simply need to understand how can we replicate those successes elsewhere throughout the country.

There's an evidence from a number of studies which show that where you grow up and the age at which you move to the suburbs or to a neighborhood that in general seems to have better conditions can really affect a child's outcomes. The kids who moved at young ages are dramatically better as adults. They're earning 30 percent more, they're 27 percent more likely to go to college, relative to the kids who stayed in the high poverty public housing projects. And so there's clear scientific evidence that you can change kids' outcomes just based on where they grow up.

The solution for rising up kids in the income distributionlies is in creating better childhood environments for kids growing up, especially in low income families. And so what means such things like schools, the quality of neighborhoods. If you think about what's gone on in Baltimore, it's a place of tremendous concentrated poverty. People aren't really seeing a path forward and I think revitalizing places like that can have a huge impact, even in the face of globalization and changes in technology.

The data show we can do something about upward mobility. Every extra year of childhood spent in a better neighborhood seems to matter.

Every extra year you spend in a better environment makes you more likely to go to college, less likely to have a teenage pregnancy, makes you earn more as an adult, makes you more likely to have a stable family situation, be married, for instance, when you're an adult.

I would say basically the commonplace observation that kids aren't going to earn as much as their parents is now is a coin flip at this point. Are you going to do better than your parents? It's a 50-50 chance, whereas if you were born in the 1940s or 1950s, you had more than a 90 percent chance you were going to do better than your parents. So basically almost a guarantee for most kids that you were going to achieve the American Dream of doing better than your parents did. Today, that's certainly no longer the case.