There are about 1m foreign teachers in the UAE, which also enables growth in the UK as people earn tax free and can afford to pay for housing when they return
Can be mistreated or exploited, often paid lower wages than nationals, have to abide poor living conditions
Female migrants from Philippines and Bangladesh can be held into contract to work as sex slaves rather than house keepers, with little support from host country
In the case of forced migration, the only positive is the migrant-refugee is safe, otherwise they usually end up in cramped conditions and victim of injustice - lower paid and often poorly housed, and even a victim of abuse