Recent experiments by Carsten De Dreu and colleagues show that intranasal administration of oxytocin makes men more cooperative with in-group members, but not out-group members, especially when fear of out-group members is high. #JoshuaGreene

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Adam Smith called it the paradox of value: when an important good becomes plentiful, it costs far less than what people are willing to pay for it. The difference is called consumer surplus, and the explosion of this surplus over time is impossible to tabulate. #StevenPinker