Look down at what you're wearing. You picked out that blue shirt, right? And those sandals — you decided on those because they're comfortable, didn't you? Well, maybe not. Researcher Jonah Berger says we tend to be pretty good at recognizing how influences like product placement and peer pressure affect other people's choices...but we're not so good at recognizing those forces in our own decisions. We talked with him in December 2016.

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