Economic Explanations for Opposition to Immigration: Distinguishing between Prevalence and Conditional Impact

What explains variation in individuals' opposition to immigration? While scholars have consistently shown cultural concerns to be strong predictors of opposition, findings regarding the labor-market competition hypothesis are highly contested. To help understand these divergent results, we distinguish between the prevalence and conditional impact of determinants of immigration attitudes. Leveraging a targeted sampling strategy of high-technology counties, we conduct a study of Americans' attitudes toward H-1B visas. The plurality of these visas are occupied by Indian immigrants, who are skilled but ethnically distinct, enabling us to measure a specific skill set (high technology) that is threatened by a particular type of immigrant (H-1B visa holders). Unlike recent aggregate studies, our targeted approach reveals that the conditional impact of the relationship in the high-technology sector between economic threat and immigration attitudes is sizable. However, labor-market competition is not a prevalent source of threat and therefore is generally not detected in aggregate analyses.