The politics of IO authority transfers: explaining informal internationalisation and unilateral renationalisation.

In the wake of international organisations’ (IOs) politicisation, treaty-based transfers of authority to or from IOs have virtually come to a standstill. Instead, we increasingly see instances of informal internationalisation and unilateral renationalisation of IO authority. In this article, we introduce a Political Contest Theory (PCT) that explains both phenomena at the same time. PCT builds on the postfunctionalist assumption that, in the age of politicisation, IO authority transfers activate a transnational cleavage between communitarian and cosmopolitan factions fighting over the ‘right’ locus of political authority. Yet, beyond extant postfunctional theorising, PCT specifies the mechanisms through and the conditions under which either the one or the other faction may prevail. We argue that communitarians can rely on a structural mobilisation advantage which allows them to assert unilateral renationalisations, whereas cosmopolitans can rely on an institutional power advantage which allows them to push through informal internationalisations. Moreover, PCT highlights a pattern of mutual reinforcement between the systematic advantages enjoyed by the opposing factions that is likely to exacerbate the polarisation over IO authority transfers in the future. [ABSTRACT FROM AUTHOR]