Question: According to a study in the New England Journal of
According to a study in the New England Journal of Medicine, your friendships or “social networks” are more likely than your genes to make you overweight (Jennifer Levitz, “Can Your Friends Make You Fat?” Wall Street Journal, July 26, 2007, D1). If it is true that people who have overweight friends are more likely to be overweight, is that an example of a negative externality? Why?
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