Two experiments were conducted to test implications derived from Lerner’s formulation of the “justice motive.” The experimental paradigm provided subjects with an opportunity to earn money in exchange for participation in future experimental sessions. Subjects who were offered “just” pay for their efforts volunteered significantly more of their time when their efforts would help a needy victim than when they would not. Moreover, when subjects were left with just pay, they offered more of their time when a portion of their pay was to go to a victim than when they received the entire wage themselves. When the pay subjects were to receive was less than deserved, however, the opportunity to help a victim did not affect their response level. The importance of these results for understanding helping behavior is considered, as is the compatibility of these results with other theoretical models.