First, according to Trumbull, Olson underestimates diffuse groups’ ability to develop compelling narratives about how they serve the public interest. In fact, weak, diffuse groups have a paradoxical political advantage: precisely because they are weak and diffuse, the public sees them as less self-interested and thus comparatively trustworthy. Second, Olson also underestimates the power of ideological motivation, rather than just money and concentration, to spur activism. Third, “diffuse interests can be represented without mobilization,” thanks to activism by politicians and government officials who take up their cause. (FDR started a federal pension program at a time when “retirees,” as a self-identified social class, did not yet exist. The program created the constituency, rather than the other way around.) Fourth, weak or diffuse interests can link up with concentrated groups to amplify their effectiveness, as when consumers align with exporters to oppose trade protections or when free-speech advocates join with political parties to oppose campaign-finance limits.