Illegal immigration refers to human immigration across the state borders of countries in such a way as to violate the immigration laws of those countries. People who do this are called illegal immigrants or illegal immigrants. Illegal immigration often happens to countries where things like jobs, shelters and socio-ethnic networks are available.
Illegal immigration can be permanent when it aims to exchange residence in one country for one in another country that is hoped to improve. In the case of illegal labor migration (often in the form of commuter migration or circular immigration), on the other hand, the place of residence is often preserved and the immigrant often returns after a while.
Sometimes it is also illegal to immigrate across state borders without permission, which is referred to as illegal emigration.
Most illegal immigration takes place from low to high socio-economic countries; often from developing countries to developed countries. Illegal immigration has many motivations, of which the search for better working and living conditions is the most important. In addition, the opportunities and benefits of successfully migrating to the target country by the immigrant are considered greater than the costs. These costs can include things like living a restrictive life as an illegal immigrant in the destination country, abandoning family and lifestyles, and the possibility of getting caught and resulting sanctions. This section focuses in particular on the immigration of Mexicans into the United States.
The neoclassical economic model looks only at the probability of success in immigrating and finding work and at increasing the real income an illegal immigrant can expect. In this explanation, the terms "push" and "pull" play an important role; how much "pull" a particular destination country has in terms of better-paying jobs and improvements in quality of life and how much "push" a particular home country has in the form of negative conditions, such as lack of work or economic mobility (chance of improving economic status).
The neoclassical theory further looks at the probability of successful illegal immigration, for which factors such as geographical proximity (distance between countries), border security, the probability and consequences of being arrested, how easy it is to find illegal work and the chances on legalization in the future. The model concludes that illegal workers in the destination country are an addition and competition for the group of unskilled workers. Illegal workers are successful in finding work within this model because they are willing to receive lower wages (sometimes below the minimum wage) than workers born in the destination country. American economist George J. Borjas supports certain aspects of this model in a study in which he concludes that American workers' net incomes fell by 9% between 1980 and 2000 as a result of competition from illegal migrant workers. Immigration scientists such as Gordon Hanson and Douglas Massey however, have criticized the model for being oversimplified and failing to account for conflicting evidence, such as in the case of US immigration the low pre-1980s net illegal immigration from Mexico to the US despite significant economic inequalities. To better account for other factors, many improvements have been suggested, some of which are listed below.
In recent decades, developing countries have attempted to reap the benefits of globalization by joining treaties aimed at liberalizing trade. But the rapid opening of home markets could lead to