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David G. Blanchflower, Bert van Landeghem, Andrew J. Oswald, Imitative Obesity and Relative Utility, Journal of the European Economic Association, Volume 7, Issue 2-3, 1 May 2009, Pages 528–538, https://doi.org/10.1162/JEEA.2009.7.2-3.528
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Abstract
If human beings care about their relative weight, a form of imitative obesity can emerge (in which people subconsciously keep up with the weight of the Joneses). Using Eurobarometer data on 29 countries, this paper provides cross-sectional evidence that overweight perceptions and dieting are influenced by a person's relative BMI, and longitudinal evidence from the German Socioeconomic Panel that well-being is influenced by relative BMI. Highly educated people see themselves as fatter—at any given actual weight—than those with low education. These results should be treated cautiously, and fixed-effects estimates are not always well determined, but there are grounds to take seriously the possibility of socially contagious obesity.