He, Changli; Sandberg, Rickard - Economics Institute for Research (SIR), … - 2005
Statistics, Stockholm School of Economics,
P. O. Box 6501, SE-113 83 Stockholm, Sweden
SSE/EFI Working Paper Series in Economics … version of the paper was presented at a seminar at Stockholm
School of Economics 2002 and the authors thank the Department of … Economics, Helsinki, Finland 2003 were the authors are especially
thankfull to Pentti Saikkonen for helpfull comments. This …