نوع مقاله : مقاله پژوهشی
1 استاد دانشکده کشاورزی دانشگاه فردوسی مشهد
2 دانشجوی دکترای گروه اقتصاد کشاورزی دانشکده کشاورزی دانشگاه فردوسی مشهد
عنوان مقاله [English]
The high proportion of sugar and lump sugar in energy consumption shows that many Iranian households depend extremely on these products in their food bundle. Therefore, recognizing consumer preferences for the types of products is very important for policy making and planning. This study aimed at investigating the structural changes in consumer preferences during 2007-17. For this purpose, the non-parametric approach based on Weak Axiom of Revealed Preference (WARP) was used. The results of nonparametric approach indicated that there was an inconsistency in the WARP matrix in 2010, 2011 and 2012; and the assumption of the reliability of consumer preferences was violated in these years mainly due to increase in tariffs of imported sugar.