Well...it might be that old "supply and demand" factor. As one example: a corporation/rancher/farmer might have the "demand" and the immigrant might have the "supply."
Push-pull factors in migration either push people out of an area due to depletion of natural resources or pull in due to abundant land that attracts people.
push factor is when something have the choice to move away from somewhere or something and pull factor is when something is forced to move.Push Factors Not enough jobs Few opportunities "Primitive"...
Push factors included a scarcity of land in the East and overcrowded cities. Pull factors included the romanticism of moving west, work on the railroads and the availability of cheap land.