The supranational institutions of the European Community (EC)-the EC C
ommission, the European Court of Justice, and the European Parliament-
play a central role in EC governance, yet scholars remain divided on t
he question of supranational autonomy and influence, with neofunctiona
lists asserting, and intergovernmentalist denying, an independent caus
al role for these institutions. The new institutionalism using rationa
l choice theory may overcome this theoretical stalemate by examining t
he functions that member state principals delegate to supranational ag
ents, the autonomy of agents in carrying out their functions, and agen
ts' ability to set the agenda for the member governments. The autonomy
and influence of supranational institutions are a function of four fa
ctors: the distribution of preferences among member state principals a
nd their supranational agents, the institutional rules governing EC po
licymaking, the information available to member governments and supran
ational agents, and the ability of supranational institutions to build
transnational constituencies within the member states.