When Time Meets Scarcity: Differentiated Effects of Promotional Restrictions on Consumer Value in Live Commerce

Drawing upon social presence and perceived value theories, this study examines how time-limited (TL) and quantity-limited (QL) promotions influence consumers’ purchase intention in live-streaming shopping. Through two controlled experiments (using countdown prompts for TL and inventory visualization for QL), the findings reveal distinct mechanisms: TL promotions elevate functional value by fostering a perception of collective synchronicity, whereas QL promotions boost social value identification through the perception of interactive control. Notably, this latter pathway is moderated by social cue sensitivity. Theoretically, this work unveils a “dual social presence–perceived value” framework that overcomes the limitations of single-mediation models and integrates evidence from eye-tracking and neurobehavioral analysis. Practically, it proposes a strategic promotion-matching criterion (recommending TL for high-circulation goods and QL for scarce items) to optimize live-streaming marketing effectiveness.