Alliance theory
Alliance theory, also known as the general theory of exchanges, is a structuralist method of studying kinship relations. It finds its origins in Claude Lévi-Strauss's Elementary Structures of Kinship (1949) and is in opposition to the functionalist theory of Radcliffe-Brown. Alliance theory has oriented most anthropological French works until the 1980s; its influences were felt in various fields, including psychoanalysis, philosophy and political philosophy. The hypothesis of a "marriage-alliance" emerged in this frame, pointing out towards the necessary interdependence of various families and lineages. Marriages themselves are thus seen as a form of communication that anthropologists such as Lévi-Strauss, Louis Dumont or Rodney Needham have described.