First Author:   Rod Garratt University of California, Santa Barbara garratt@econ.ucsb.edu   Rod Garratt, Department of Economics, University of California Santa Barbara, 93106, USA   (805) 893-2849(Phone) (805) 893-2849(Fax) http://www.econ.ucsb.edu/~garratt/faculty/garratt.htm Second Author: Cheng-Zhong Qin University of California, Santa Barbara qin@econ.ucsb.edu