  We analyse a coupled dataset collecting the mobile phone communications and
bank transactions history of a large number of individuals living in a Latin
American country. After mapping the social structure and introducing indicators
of socioeconomic status, demographic features, and purchasing habits of
individuals we show that typical consumption patterns are strongly correlated
with identified socioeconomic classes leading to patterns of stratification in
the social structure. In addition we measure correlations between merchant
categories and introduce a correlation network, which emerges with a meaningful
community structure. We detect multivariate relations between merchant
categories and show correlations in purchasing habits of individuals. Finally,
by analysing individual consumption histories, we detect dynamical patterns in
purchase behaviour and their correlations with the socioeconomic status,
demographic characters and the egocentric social network of individuals. Our
work provides novel and detailed insight into the relations between social and
consuming behaviour with potential applications in resource allocation,
marketing, and recommendation system design.
