An image of a football match with supporters on the stands in the background
(featured image: Goran Has/Flickr CC BY 2.0)

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Is it irrational to favour people with whom you have something important in common?

magine the prime minister of your country is not someone you naturally align with: in fact, you’d rather see him or her defeated at the next election. But then you suddenly learn that your PM is a life-long supporter of the same football team that you have been a fan of since you were a kid. What effect does…