Is the United States is an Oligarchy?

Each of our four theoretical traditions (Majoritarian Electoral Democracy, Economic Elite Domination, Majoritarian Interest Group Pluralism, and Biased Pluralism) emphasizes different sets of actors as critical in determining U.S. policy outcomes, and each tradition has engendered a large empirical literature that seems to show a particular set of actors to be highly influential. Yet nearly all the empirical evidence has been essentially bivariate. Until very recently it has not been pos...