“…It has been applied to studying the profitability of maize cultivation in Portugal, before this country joined the European Community (Fox et al, 1990), and also in various developing countries (Nelson and Panggabean, 1991;Pearson et al, 1995;Yao, 1997;Adesina and Coulibaly, 1998;Fang and Beghin, 2000). The possibility of incorporating environmental considerations into the PAM has opened new perspectives for the analysis of farming in areas of high ecological value (Kydd et al, 1997;Pearson et al, 2003).…”