“…Second, trade liberalization often involves multilateral negotiations (e.g., WTO negotiations), suggesting the need to present the arguments in the context of "many nations." This would extend the previous research on the relative efficiency of agricultural policy instruments (e.g., Wallace;Gardner, 1983Gardner, , 1987DeGorter and Meilke;Bullock;Moschini and Skokai;Alston, Carter and Smith;Gisser;Bullock, Salhofer and Kola). Finally, while previous theoretical work on trade liberalization has often focused on infinitesimal changes in policy instruments (e.g., Vousden;Neary, 1992, 1996;Neary;Turunen-Red andWoodland, 1991, 2000), it would be useful to extend such an analysis to cover the more realistic case of discrete changes in government policy.l…”