Time consistency and time invariance in collective intertemporal choice
澄清了集体跨期选择中时间一致性与时间不变性、平稳性的区别，指出非独裁的社会偏好虽不能平稳，但放弃时间不变性后仍可时间一致，并论证时间不变性在规范性和描述性上存在问题。
Recent work on collective intertemporal choice suggests that non-dictatorial social preferences are generically time inconsistent. We argue that this claim conflates time consistency with two distinct properties of preferences: stationarity and time invariance. While time invariance and stationarity together imply time consistency, the converse does not hold. Although non-dictatorial social preferences cannot be stationary, they may be time consistent if time invariance is abandoned. If individuals are discounted utilitarians, revealed preference provides no guidance on whether social preferences should be time consistent or time invariant. Nevertheless, we argue that time invariant social preferences are often normatively and descriptively problematic.