Many international joint business ventures use English as their working language, even if none of the members are officially English-speaking. For example, it is the working language of the Asian trade group ASEAN and the oil exporting organization OPEC, and it is the official language of the European Central Bank, even though the bank is located in Germany and Britain is not even a member of the Eurozone. Switzerland has three official languages (German, French and Italian and also, in some limited circumstances, Romansh), but it routinely markets itself in English in order to avoid arguments between different areas. Wherever one travels in the word one see sees English signs and advertisements.