This paper refines a previously introduced procedure to quantify objective dependence relations between agents of a multiagent system. The quantification of the dependence relations is performed on a specially defined form of reduced dependence graphs, called dependence situation graphs. The paper also shows how the procedure can be used to determine a measure of the dependence that a society as a whole has on each agent that participates in it and, correlatively, a measure of the negotiation powers of the agents of such society. The procedure is also extended to allow for the refinement of the objective degrees of dependence into subjective ones, through the use of auxiliary coefficients that can represent some subjective aspects of the dependence relationships. A sample calculation of objective degrees of dependence and negotiation powers of agents of a simple multiagent system is presented, and a hint is given on how degrees of dependence could be used to support social reasoning processes.