"A main avenue for influencing public policy available to unions and business is public opinion campaigning. As groups with substantial credibility in the minds of the public, unions and employers have the potential to move immigration attitudes and, thereby, have a long-term indirect influence on immigration policy. The article asks, first, who is (not) convinced by arguments from business or labour leaders and second, what messages are most convincing. We present the results of a survey experiment in three very different immigration regimes and interest group environments (Canada, the UK and Germany). The results suggest that the net effects of public arguments are small, but vary widely across demographic groups."

Support: Digital