Poor people are not just victims of a misallocation of resources. They rather lack, or are denied, the resources needed to fulfil social demands and observe the customs and laws of society. This realisation led to the development of "relative deprivation" approach, under which a threshold in each dimension of poverty is envisaged, according to prevailing social norms, below which withdrawal or exclusion from active membership of society is common. Relative measures are most frequently used in wealthier societies.