ZURICH, Nov 5 (Reuters) - If UBS were to leave Switzerland, the consequences for tax revenues and Swiss companies would be severe, Carmen Walker Spaeh, Zurich's economic affairs chief and current. 0ZURICH, Nov 5 (Reuters) - If UBS were to leave Switzerland, the consequences for tax revenues and Swiss companies would be severe, Carmen Walker Spaeh, Zurich's economic affairs chief and current president of the cantonal government, told Swiss newspaper NZZ in.