Interesting short paper on economic mobility, based on US data, covering both the geography of upward mobility and the factors which seem to account for that variability. The factors are not very surprising in themselves; but the strength of their association with place is very striking – every year of childhood spent in a more upwardly mobile place makes the child more likely to be upwardly mobile. So the policy solution could be to move all the children. Or it could be to address the underlying issues without moving the children at all.