This paper revisits Ernst Engel's (1857) original article in which he systematically investigated the relationship between consumption expenditure and income. While he is mainly remembered today for the discovery of Engel's law, we highlight how Engel addressed in a particular way the issue of...

The Theory of Dyadic Morality (TDM; Schein and Gray (2018)) posits that immorality judgments emerge from norm violations, harm perceptions, and negative affect. We test this core prediction in an applied setting: voluntary payment settings, such as the Pay-What-You-Want mechanism. In our study,...

Weitzman (2014) proposed that focusing international climate negotiations on a uniform carbon price is more effective than Paris style negotiations in achieving ambitious climate action. We put this hypothesis to an experimental test by simulating international negotiations on climate change in...

Individual decision-making in Pay-What-You-Want settings is prone to social influence. Es pecially payment observability and the social relationship with other buyers during the payment decision are two important components of social influence. In practical applications of Pay-What-You-Want both...