No previous research has investigated the relationship between the concept of self and materialism, especially among teenagers. Our study seeks to reverse this trend by examining how independent self-construal and interdependent self-construal affect materialism among Brazilian teenagers (grades 7 through 12). Hypotheses were tested using structural equation modelling. We find that independent selfconstrual has a positive effect on materialism. Furthermore, we created three sub-constructs out of the original interdependent selfconstrual construct, none of which affected materialism in the same way. Group dependency, a need to achieve the group's authorisation, increases materialism; group loyalty, an attitude of group fidelity, has no effect on materialism; and group respect, a respect for group decision, diminishes materialism. These are interesting results, because they question our prior beliefs on the matter and introduce new factors into the scholarly discussion of this issue.