migration Duisburg example according to Jackson (establishment of an iron smelting plant in the 1950s)
• Rising volume and rate of migration but with considerable cyclical variation
• A rising rate of turnover (transition migration)
• A balancing of incoming and outgoing migration (return and to other cities)
• 1/3 of migrants came from within 25km periphery (a days walk), 1/3 from within 99 km periphery
• Migration within a restricted geographical field→No "disintegration" of sending/receiving communities
• High level of return migration attests to the great attachment to origin community
• Migration = limited to early adulthood; other age groups = residential stability