The new diaspora model of migration incorporates intensity (the number of people moving to a country), and assortativity (the destination within the country). The model considers only the existing diaspora sizes in the destination country, influencing the probability of migrants selecting a specific residence. Despite its simplicity, it reproduces the observed stable flow and distribution of migration in Austria (postal code level) and US metropolitan areas, yielding precise estimates of migrant inflow at various geographic scales.

https://academic.oup.com/pnasnexus/article/3/5/pgae178/7674968