The "us versus them" mindset coupled with our social nature implies that we have an innate need to belong to clearly defined in-groups.
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About Gad Saad, The Consuming Instinct: What Juicy Burgers, Ferraris, Pornography, and Gift Giving Reveal About Human Nature
Gad Saad, The Consuming Instinct: What Juicy Burgers, Ferraris, Pornography, and Gift Giving Reveal About Human Nature.