The institutional development of the aljama exerted a powerful force on local mudéjar society, but in the realm of fiscal and judicial administration the lines between Christian and Muslim communities were seldom firmly drawn. In any event, justice and finance are only two of the aspects which contribute to the formation of identity. For instance, people's sense of self is also shaped by the economic activities in which they engage, and the formal and informal social networks which they participate in as a consequence. Thus, in the Ebro Valley the economy was a powerful engine of integration, all the more so because Muslims' range of economic activity was wide. This variety was due in a good part to the fact that the vast majority of these people were “free” subjects with little restriction on their movement or their ability to dispose of goods. Although there were exceptions, no general pattern of loss of such rights can be discerned over the course of the twelfth and thirteenth centuries. Given mudéjares' number and civil status, commercial and productive activities would have served to integrate them into the wider society of the Crown both as individuals and as a community. In a manner analogous to the effect which Christian administrative domination had on Muslim institutions, participation in Christian markets drew mudéjares into “Occidental” modes of economic interchange.