The effect of migration on unemployment is actually positive: it provides cheap labor for receiving countries, and lowers the supply of labor in source countries where employers can often not afford to pay sufficient wages to their workers. The claim that immigrants take jobs away from native citizens is unfounded. In the United States, for example, visa applications for skilled foreign workers are extremely difficult to receive and are limited to a small number of people. Foreign students at U.S. universities even need special authorization to work a summer job. Immigrants cannot undercut U.S. workers wages, taking their job away for less money, because foreign workers must be paid a minimum salary, mandated by law. [1] Even illegal immigrants who do not follow these regulations tend to take very-low-paying jobs that are unwanted by U.S. citizens and that would not otherwise exist.  [1] Farhad Sethna, “Immigrants Don’t Take Away U.S. Jobs!” Immigration Law Blog, July 9, 2009, accessed June 30, 2011,  .