1. Agglomeration and Social Networks Research Lab, ELKH Centre for Economic and Regional Studies , 1097 Budapest , Hungary
2. Centre for Regional Science at Umeå University , 901 87 Umeå , Sweden
3. Department of Geography, Umeå University , 901 87 Umeå , Sweden
4. Department of Sociology, Umeå University , 901 87 Umeå , Sweden
5. Centre for Demographic and Ageing Research, Umeå University , 901 87 Umeå , Sweden