Whether a pair of migrants befriend each other or a neighbourhood has a density of a particular ethnicity, such as in Chinatown, migrants are drawn to each other. As humans, we like to find people similar to ourselves. Migrants, in an environment surrounded by the unfamiliar, are often drawn to the familiar. Migrant groups, or migrant cluster groups, can provide this familiarity.
Large migrant groups such as in Chinatown are common in major cities. Labelled as such, we know in that area we expect a wide variety of Chinese food and shops, and a concentration of Chinese migrants. Other nationalities gather with a similar density in particular suburbs or neighbourhoods in cities. Why do migrant cluster groups happen and what are they good/bad for?