Which of the following is not included in Ravenstein's law of migration?

Ravenstein held that natives of towns are less migratory than those of rural areas, so the claim that town natives are more migratory than rural natives is not one of his laws. That most migrants move only a short distance, that females are more migratory than males within their country of birth, and that each migration stream produces a compensating counter-stream are all propositions in Ravenstein's laws of migration.