https://www.vox.com/2014/4/18/5624310/martin-gilens-testing-...

> When the authors look only at the preferences of average citizens, it appears that they do have a pretty big effect on policy change. But when they add the preferences of economic elites and interest groups to the analysis, the impact of average citizens vanishes entirely. Basically, average citizens only get what they want if economic elites or interest groups also want it.