A large body of laboratory-based research suggests that people display substantial in-group bias even based on trivial groupings. We use the release of a popular augmented reality game Pokémon Go to study this phenomenon in a hybrid lab-field experiment. We analyze the behavior of over 900...

Cooperation is central to human societies. Yet relatively little is known about the cognitive underpinnings of cooperative decision-making. Does cooperation require deliberate self-restraint? Or is spontaneous prosociality reined in by calculating self-interest? Here we present a theory of why...

A key element of human morality is prosocial behavior. Humans are unique among animals in their willingness to pay costs to benefit unrelated friends and strangers. This cooperation is a critical part of our identity as moral beings. Here, we ask why humans cooperate, and what can explain...

The human willingness to pay costs to benefit anonymous others is often explained by social preferences: rather than only valuing their own material payoff, people also care in some fashion about the outcomes of others. But how successful is this concept of outcome-based social preferences for...

Understanding human cooperation is of major interest across the natural and social sciences. But it is unclear to what extent cooperation is actually a general concept. Most research on cooperation has implicitly assumed that a person's behavior in one cooperative context is related to their...

When risk averse forecasters are presented with risk neutral proper scoring rules, they report probabilities whose ratios are shaded towards 1. If elicited probabilities are used as inputs to decision-making, naive elicitors may violate first-order stochastic dominance.

This paper studies how dual-self (Fudenberg and Levine, 2006) decision-makers can use commitment technologies to combat temptation and implement long-run optimal actions. I consider three types of commitment technologies: carrot contracts (rewards for ‘good’ behavior financed by borrowing...