Institutional seats of the European Union are based in Luxembourg City along with the European Investment Bank. The Economic and Social Committee and the Committee of the Regions are entirely based in Brussels while the European Central Bank is based in Frankfurt and Europol is the only agency to have its seat fixed by the treaties, in The Hague. Separately, the Treaty of Nice establishes Brussels as the venue for all formal summits of the European Council after 2004. However some extraordinary sessions are sometimes held outside the city. The European Council's seat is however fixed by a declaration rather than a protocol, meaning it is
European Central Bank Annual Report are in the official languages of the EU. The European Central Bank (and by extension, the Eurosystem) is often considered as the "most independent central bank in the world". In general terms, this means that the Eurosystem tasks and policies can be discussed, designed, decided and implemented in full autonomy, without pressure, or need for instructions from any external body. The main justification for the ECB independence is that such institutional setup helps maintaining price stability. In practice, the ECB's independence is pinned by four key principles: In addition to its independence, the ECB is subject to limited