Migration spillovers within families: Evidence from Thailand

When a person migrates, are their family members more likely to migrate too? I estimate the causal impact of family migrant network size on migration decisions using household survey data from rural Thailand. Large but temporary labor demand shocks in a nearby city—originating from a national infrastructure program—provide plausibly exogenous variation in family members' migration decisions based on their ages at the time of the program. Among those too young to be directly impacted by the program, I find that each older family migrant increases their migration probability by about 5 percentage points. Further analysis suggests a role for better information about the destination in driving this impact. My findings imply that the short-run benefits of relieving migration constraints can underestimate the long-run benefits due to spillovers within the household.