³⁹Dubey et al. (2022) provide an explicit model on how such insatiability is computationally useful while leading to less happiness. Lambie and Haugen (2019) consider insatiability as an important component of greed. On the other hand, it is true that some purely biological needs are satiable to some extent—for example, hunger is reduced by eating, even if momentarily—but classical reinforcement learning theory is lacking much consideration of such metabolic states (Keramati and Gutkin, 2014). See footnote 37 in Chapter 16 for some ancient philosophical references on the topic.