Jussi Jaakkola's research focuses on systemic interrelations between tax law, international economic integration and democracy, especially in the framework of the European Union. Jaakkola’s research also addresses the unfolding of political ideas on inter-state regulatory competition and how these ideas transform the perceptions of the law. Jaakkola is interested in the long-term development of political, legal and economic ideas in their given historical contexts. The ways of legitimising and rationalising tax policy choices lie at the core of his research.