Four studies examined the willingness of young, healthy individuals to take drugs intended to enhance their own social, emotional, and cognitive traits. We found that people were much more reluctant to enhance traits believed to be more fundamental to self-identity (e.g., social comfort) than...

Does asking people about their future behavior increase or decrease the likelihood that they will repeat their past behavior? In two laboratory and two field experiments, we find that behavior prediction strengthens behavior repetition, making people more likely to do what they normally do, when...

It is widely believed that increasing the equality of material possessions or income in a social group should lead people at the bottom of the distribution to consume less and save more. However, this prediction and its causal mechanism have never been studied experimentally. Five studies show...

Does asking people about their future behavior increase or decrease the likelihood that they will repeat their past behavior? In two laboratory and two field experiments, we find that behavior prediction strengthens behavior repetition, making people more likely to do what they normally do, when...