Institution: | 1. Trinity College and Faculty of Economics and Politics , University of Cambridge , Cambridge , CB3 9DD , United Kingdom E-mail: hashem.pesaran@econ.cam.ac.uk;2. Departement de Sciences Economiques and C.R.D.E. , Université de Montréal , Montréal , Québec , H3C 3J7 , Canada E-mail: rugemurf@crde.umontreal.ca |