Different factors are: Fertility rates, mortality rates, internal migration and international migration
if there is a low fertility rate and low mortality rate there will be a high dependency ratio and low replacement ratio - means that need to attract internal or international migration to fill vacancies
international migration is caused by social clustering, accessibility to key cities, physical factors and government policies
internal migration can lead to the studentifcation of an area which brings a drinking culture
increased students mean a highly skilled future workforce which creates a positivemultiplier effect
international migration is creating diasporas and ethnicenclaves which is reflected in the built environment and community
assimilation of international migrants means they will have less of an impact on a place
segregation of international migrants means they may not integrate into society as well