本研究探讨了不同消费场景——共有消费和单独消费，对消费者食物消费和食物浪费的不同影响，以期推动全社会“反食物浪费”的攻坚战。通过一个田野研究、四个实验研究和一项单篇文章的元分析发现：相比于单独消费，共有消费会更容易引发自我表现顾虑和责任分散偏差，进而导致更多的食物消费和食物浪费。具体而言，一方面，人们在共有消费（vs.单独消费）场景中会更希望表现出积极的自我，从而会利用食物的过度消费和浪费来获取更多社交益处；另一方面，共有消费（vs.单独消费）会产生责任分散现象，从而减轻人们对食物浪费的负面感受。但是，当群体内成员关系较为亲密时，以上效应会消失甚至逆转。值得一提的是，研究发现一个有效且简单的助推策略，即唤起个体责任感的干预信息能够显著减少共有消费情境下的食物浪费。

In response to the urgent global issue of food waste, our research investigates an unexplored dimension: the effect of joint versus individual consumption. Using one field, four experimental studies and a single-paper meta-analysis, our re- search finds that compared to individual consumption, joint consumption results in increased food consumption and subsequent waste. This behavior is driven by a heightened concern about self-presentation and a diffusion of responsibility among group members. Importantly, we observed that when group members in the joint consumption share close relationships, this effect diminishes or even reverses. Furthermore, our study proposes a practical solution for addressing food waste in joint consumption scenarios by implementing intervention messages that highlight individual responsibility.