1 Parametric and non-parametric estimation of soil conservation impact on productivity in the northwestern Ethiopian highlands Menale Kassie 1* , Stein T. Holden 2 1 Environmental Economics Policy Forum of Ethiopia, P.O.Box 2479, Addis Ababa, Ethiopia 2 Department of Economics and Resources Manag ement, Norwegian University of Life Science, P.O.Box 5033, N-1432, Aas, Norway Contributed paper prepared for presentation at the international Association of Agricultural Economists Conference, Gold Coast, Australia, August 12-18, 2006 Copyright 2006 by Menale Kassie and Stein T. Holden. All rights reserved. Readers may make verbatim copies of this document for non-commercial purposes by any m eans, if this copyright notice appears on all such copies. * Corresponding author: Tel.: +251-115-538632; Fax: +251-115-505588; email address: dawitkassie@yahoo.com (Menale Kassie)