In Iberian large ditched enclosures one of the main patterns is the presence of exogenous materials that reveal that those sites were integrated in large trade networks. Ivory, cinnabar, variscite, amber, shells, some specific potteries, etc. These raw materials or objects made of them are present in those large enclosures in regions where they do not exist.
The questions are: is this evidence of just trade? Or is it evidence of something else? For instance, of the social importance of gift. It is possible that many of these ditched enclosures were stages where potlatch type ceremonies might have been performed and the exchange of rare exotic objects as gifts might have had a significant social role.