This study aims to address how and when retailers’ sustainability efforts translate into positive consumer responses. Hypotheses are developed and tested through a scenario-based experiment among 672 consumers. Retailers’ assortment sustainability and distribution sustainability are manipulated. Retailers’ sustainability efforts lead to positive consumer responses via two underlying mechanisms: consumers’ identification with the store and store legitimacy. The effects of sustainability efforts are strengthened if consumers have personal norms favoring shopping at environmentally friendly stores. Remarkably, when controlling for moderation by personal (...) norms, social norms weaken the effects. The findings show that traditional marketing mix elements provide opportunities for retailers to improve their organizations’ bottom line and positively affect consumer well-being. This study helps retailers decide whether or not to invest in and communicate about sustainability. Past research has shown the clear potential for positive consumer responses to firms’ sustainability efforts, but little is known about the underlying mechanisms and the conditions under which such responses take place. This study advances theory by examining personal and social factors as mediators and moderators of the retailers’ sustainability efforts–consumer responses relationship. (shrink)