Sufficiency without regret
提出充足性概念，指在不损害个人福祉的前提下减少环境外部性的生活方式改变，并分析在偏好不确定下个体选择充足性生活方式的可能性及政策支持的必要性。
The notion of sufficiency has gained considerable traction in many social sciences as well as in environmental and energy policy. However, sufficiency is not widely discussed in economics, most likely because it is seen as being hard to identify or uninteresting in the context of the standard model of rational choice. In this paper, we introduce a concept of sufficiency, which we define as a change of lifestyle that reduces environmental externalities without compromising individual well-being. We advance a framework of individual choice, where individuals select lifestyles and face uncertainty regarding their preferences in hitherto not experienced lifestyles. We show that changes towards sufficiency are feasible in this setting but, although they can be beneficial to the individual, they might require policy support.