“Everyone has the right to freedom of movement and residence within the borders of each State. “Migrations are complex, often global phenomena; migrants depart from specific places and choose their destinations among many cultures (Harzig & Hoerder, 2009). Indeed, Demko, Ross & Schnell (1970) emphasize the latter, defining migration as the most complex component of demographic change. It provides an important network for the diffusion of ideas and information and indicates symptoms of social and economic change and can be considered as human adaptation to economic, environmental and social problems (Sinha, 2005). Furthermore, he continues, migration is the most difficult component of change to plan due to the uncertainty linked to the decision to change place of residence. Say no to plagiarism. Get a tailor-made essay on "Why Violent Video Games Shouldn't Be Banned"? Get an original essay Dudley (1970) described population migration as an expression of interaction in space but differs in some essential characteristics from other channels of interaction, mainly in terms of the goods that are transported. According to Sinha (2005), migration is seen as a form of individual or group adaptation to perceived changes in the environment. Chapman (1979) considered migration to be a good example of diffusion of relocation because no body can literally be in two places at the same time. Harzig & Hoerder (2009) continue to highlight this fact; that migration involves multiple options: mobility can be multidirectional and multiple, temporary or long-term, voluntary or forced. Although migration is as old as humanity itself, theories of migration are quite new, according to Hagen-Zanker (2008). One of the first writers on modern migration is Ravenstein, who in 1880 based his “Laws of Migration” on empirical data on migration. This collection of empirical regularities, such as the fact that most migrants travel only short distances, was far from a complete theory of migration. Early migration models (e.g. Zipf, 1946) used the physical concept of gravity and explained migration as a function of source and destination population size and predicted it to be inversely related to distance. While early analyzes look at aggregate data and often see migration as an equilibrium mechanism, since the 1980s attention has focused on more elaborate microeconomic models, Hagen-Zanker (2008) continues to state. These models analyze individual motivations for migration, but also consider structural factors at the community level (e.g. poverty). More modern approaches connect the micro and macro levels and also include less economic concepts, for example social capital. Another contribution of the most recent literature is the differentiation between causes and perpetuation of migrations. The new economics of labor migration developed in the 1980s views migration as a family decision and includes more explanations for migration. It differs from classical migration theories in that it seeks to model the decision-making process more realistically by including a wider range of decision-making factors.