And we still fear outsiders. Most of us living in rich countries seem content with immigration policies that exclude people from our own societies simply because of where they were born. The idea that immigration is excessive, out of control, and damaging is not just acceptable but the majority view in many countries. That view may be popular, but it is a mistake. Recall that Katherine Phillips and her colleagues found that small student groups disliked having a stranger in their midst, even as the stranger was helping them solve the murder-mystery problem they faced. We suffer the same
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