Pedestrians walk past MUNI buses reserved for America's Cup transportation on Fillmore Street in the Marina in San Francisco, Calif., on Sunday, August 26, 2012.
Pedestrians walk past MUNI buses on Fillmore Street in the Marina in San Francisco, Calif., a neighborhood that scores high on economic connectedness.
  • Harvard research indicates friendships with richer people are linked to upward economic mobility.
  • A study found people in distressed communities often live in areas with few cross-class ties.
  • Integrating low-income communities with higher-income ones could boost social mobility.

Befriending rich people can do a whole lot to boost your economic mobility, but you need to be able to find them first.