What concept describes people who leave the unsatisfactory conditions of their homeland for better conditions in another country

economic migration

Explanation:

When people move from one country to another we have a migration. If the reasons for that migration is the living conditions, being poor in the country they are from, and want to move in a country with much better ones, it is an example of economic migration. This can also be seen from a push and pull factor perspective, as they are what cause the migration. The poor conditions in the country of origin are push factor that make the people move away. The better conditions in another country are a pull factor, as they attract these people to chose that particular country as their next destination.