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In this paper we present Ñuu Xaa, a tin collecting bank to support homeless people's self-subsistence in the city of Huajuapan de León. The main goal of this system is to improve homeless people's quality of life by providing them with the opportunity to have remunerative self-employment. We think that the implementation of Ñuu Xaa will bring homeless people social, economical and psychological benefits because they will be able to earn enough money in order to satisfy their elementary needs and the community will understand that homeless people aren't lazy but just people in need.
Ruíz et al. (Sat,) studied this question.