Immigration currents characteristics (Everett defined by me):
1. that immigration tends to occur within well-defined streams, where the settlement process resulting therefrom tend to occur on the body and stability, such as the Italian immigration from Sicily and southern Italy towards the cities of the northern United States currents, while migrated large numbers of Italians to Mpadaa and Tuscany towards South America especially Buenos Aires.
2. It shall be established for each stream mainstream versus migration in the opposite direction, and the opposite trend arises as a result of the disappearance or weakness of expulsion factor in diminishing the original home or place of attractions in Al Wasl.
3. that the efficiency of the migration stream currents contrast, tend to fall if the asset and access similar place, meaning that net migration tends to zero.
4. that the efficiency of migration flows are high if they are large overlapping barriers, for example: Migrants from Pennsylvania to California reluctant to return because of the prohibitive costs to return.
5. that the efficiency of migration flows in line with the economic conditions shall be high in good times and low in bad times, because in times of economic boom sudden the regular areas for the arrival of immigrants is rapidly expanding to attract immigrants at a high rate, and there is no return on stream only in small numbers, but in the Times The current recession is increasing the size of the return to the original area.
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