Is Poor Fitness Contagious? Evidence from Randomly Assigned Friends
AbstractThe increase in obesity over the past thirty years has led researchers to investigate the role of social networks as a contributing factor. However, several challenges make it difficult to demonstrate a causal link between friends’ physical fitness and own fitness using observational data. To overcome these problems, we exploit data from a unique setting in which individuals are randomly assigned to peer groups. We find statistically significant peer effects that are 40 to 70 percent as large as the own effect of prior fitness scores on current fitness outcomes. Evidence suggests that the effects are caused primarily by friends who were the least fit, thus supporting the provocative notion that poor physical fitness spreads on a person-to-person basis.
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Bibliographic InfoPaper provided by National Bureau of Economic Research, Inc in its series NBER Working Papers with number 16518.
Date of creation: Nov 2010
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Other versions of this item:
- Carrell, Scott E. & Hoekstra, Mark & West, James E., 2011. "Is poor fitness contagious?: Evidence from randomly assigned friends," Journal of Public Economics, Elsevier, vol. 95(7-8), pages 657-663, August.
- I18 - Health, Education, and Welfare - - Health - - - Government Policy; Regulation; Public Health
- I2 - Health, Education, and Welfare - - Education
- Z13 - Other Special Topics - - Cultural Economics - - - Economic Sociology; Economic Anthropology; Social and Economic Stratification
This paper has been announced in the following NEP Reports:
- NEP-ALL-2010-11-13 (All new papers)
- NEP-HEA-2010-11-13 (Health Economics)
- NEP-URE-2010-11-13 (Urban & Real Estate Economics)
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