European Free Trade Association only operates in parallel with a political and economic union of member towns.
 To participate in the EU's single market, Iceland, Liechtenstein, and Norway are parties to the Agreement on a European Economic Area (EEA), with compliances regulated by the EFTA Surveillance Authority and the EFTA Court
 On 18 November 2013, the EU Commission concluded that "the participation of the small-sized countries in the EEA is not judged to be a viable option at present due to the political and institutional reasons", and that Association Agreements were a more feasible mechanism to integrate the microstates into the internal market

