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Romantic partners often have to sacrifice their interests to benefit their partner or to maintain the relationship. In the present work, we investigated whether relative power within the relationship plays an important role in determining the extent to which partners are likely to sacrifice. Drawing from both classic theories and recent research on power, we tested two competing predictions on the relationship between power and sacrifice in romantic relationships. We tested whether (a) power is negatively related to sacrifice and (b) power is positively related to sacrifice. Furthermore, we also explored whether the association between power and sacrifice is moderated by commitment and inclusion of the other in the self. To test our hypotheses, we used different methodologies, including questionnaires, diary studies, and videotaped interactions. Results across the five studies (N = 1,088) consistently supported the …