Relationships are not only an expression of sociability and the pleasure of being together. They also have a "utility" dimension: under certain conditions, they are a means of accessing resources. People who are in a relationship provide each other with many services, but these services alone are not enough to qualify relationships. This chapter examines the way in which relationships and networks can become resources, particularly economic resources, but also form the basis of daily mutual aid and influence. The best known case is that of the labor market, but the "economic" use of relationships goes far beyond that. Mutual aid and social support, but also influence within the personal network are other forms of relational resources.