premise: The world trade organisation (WTO) is an organisation headquartered in Switzerland, tasked with supervising and liberalising international trade between nations. The WTO is comprised entirely of 159 member states, and 25 observer states, with 14 states being neither members nor observers. Accession to membership involves an application, which involves becoming an observer state prior to accession. Iran is currently the largest non-member economy and Tajikistan being the organisations newest member.
hypothesis: Switzerland is a member of the world trade organisation.