We study how the diﬀusion of being pivotal aﬀects immoral outcomes. In our main experiment, subjects decide about agreeing to kill mice and receiving money versus objecting to kill mice and foregoing the monetary amount. In a baseline condition, subjects decide individually about the life of one mouse. In the main treatment, subjects are organized into groups of eight and decide simultaneously. Eight mice are killed if at least one subject opts for killing. The fraction of subjects agreeing to kill is signiﬁcantly higher in the main condition compared with the baseline condition. In a second experiment, we run the same baseline and main conditions but use a charity context and additionally study sequential decision making. We replicate our ﬁnding from the mouse paradigm. We further show that the observed eﬀects increase with experience, i.e., when we repeat the experiment for a second time. For both experiments, we elicit beliefs about being pivotal, which we validate in a treatment with non-involved observers. We show that beliefs are a main driver of our results.
Diffusion of Being Pivotal and Immoral Outcomes
Armin Falk, Thomas Neuber and Nora Szech