Those moving to California tend to have higher incomes. About 35% of working-age people moving in make more than $50,000 annually, compared with 27% of those moving out.
The disparity gets progressively pronounced at the lower end of the income scale.
For those making $40,000 to $49,999, for instance, the net loss of population is 15,403 residents since 2007. The loss is 22,754 residents in the $30,000 to $39,999 range, then more than doubles to 46,318 residents in the $20,000 to $29,999 range.
"Housing prices are a primary factor, because that's usually the first thing you deal with when you're moving," said Dowell Myers, a professor of demography and urban planning at USC.