Hence the unraveling of working-class families. The two-parent family, still the norm among the elite, is vanishing among the poor. In rich countries the proportion of births outside marriage has trebled since 1980, to 33%. In some areas where traditional manufacturing has collapsed, it has reached 70% or more. Children raised in broken homes learn less at school, are more likely to drop out and earn less later on than children from intact ones. They are also not very good at forming stable families of their own.