TY - GEN digital ID - 131272687 TI - Is Poor Fitness Contagious? Evidence from Randomly Assigned Friends AU - Carrell, Scott E. AU - Hoekstra, Mark AU - West, James E. PY - 2010 PB - Cambridge, Mass. National Bureau of Economic Research DB - UniCat KW - Zonder onderwerpscode: economie UR - https://www.unicat.be/uniCat?func=search&query=sysid:131272687 AB - The 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. ER -