Stephan Tontrup

Does the Endowment Effect Justify Legal Intervention? The Debiasing Effect of Institutions

We claim that the endowment effect rarely justifies legal intervention in private ordering. We present the first theory, to our knowledge, to explain how institutions inhibit the endowment effect without altering people’s rights to their entitlements. The endowment effect is substantially caused by anticipated regret. We show that people experience regret only when they feel responsible for the decision and can mute regret by trading through institutions that let them share responsibility with others. As entitlement holders typically transact through institutions, we expect most people to make unbiased trading decisions in real markets. We test two common institutions—agency relationships and voting—that divide responsibility between multiple actors. Each caused most subjects to debias and trade in our study. We also show that people intentionally debias by employing institutions in order to share responsibility. Thus, when people can freely transact, private ordering generally overcomes the endowment effect.

Disentangling Psychological Sources of Overpricing in Anticommons Dilemmas: Strategic Incentives, Endowment Effects, and Interdependence of Outcomes

The realization of market transactions often depends on decisions in groups in which members are anonymous and cannot communicate, but have interrelated outcomes. In a comprehensive study, we investigated the interaction of group effects, strategic effects and endowment effects in different group situations. We show that groups display an endowment effects for uncertain goods which is reduced by about 50% compared to the endowment effect in individuals in corresponding situations. In group situations with additional strategic incentives to overprice the endowment effect completely diminished. The strategic effects and group effects on pricing in group situations cannot be found for participants’ personal valuations of the good, whereas the endowment effect for personal valuations prevailed in both group conditions. This indicates that the endowment effect might be more fundamental than group effects and strategic effects. A paramorphic model for pricing in strategic group situations is suggested and practical implications are discussed.