University of Tehran Iranian Journal of Agricultural Economics and Development Research 2008-4838 52 2 2021 06 22 Testing of Weak Separability and Estimating of Meat Demand System in Iran (Application of Rotterdam Demand System) Testing of Weak Separability and Estimating of Meat Demand System in Iran (Application of Rotterdam Demand System) 215 228 82424 10.22059/ijaedr.2020.291333.668830 FA Amin Delavar PhD Student of Agricultural Economics, Payame Noor University, Tehran, Iran Gholamreza Yavari Associate Professor of Agricultural Economics, Payame Noor University, Tehran, Iran Saeid Yazdani Professor of Agricultural Economics, Faculty of Agricultural Economics and Development, University of Tehran, Karaj, Iran Afshin Amjadi Assistant Professor of Agricultural Economics, Institute of Planning Research, Agricultural Economics and Rural Development, Tehran, Iran Abolfazl Mahmoodi Associate Professor of Agricultural Economics, Payame Noor University, Tehran, Iran Journal Article 2019 10 29 The separability of consumer desires is a necessary and sufficient condition for multi-stage budgeting and collectivization is consistent of commodity where costs are allocated between edible groups by price indices and intergroup allocations are made independently other groups. Given the high share of meat types (23 percent of household food and beverage expenditure) in the household budget and the important nutritional role of meat in people's health  to  determine the consumption pattern of meat products in Iran used to Rotterdam demand function in this study. In empirical studies of demand, the concept of separation is employed to correctly estimate demand function and limit the number of parameters. For this purpose, data of price index and cost of meat types (livestock, birds, fish) central Bank over the years 1995-2016 were used. The results of the separability tests support the hypothesis that a consumer first divide their income between 13 meat products in three groups (livestock, birds, fish) assigns and then approves the allocation action between the types of meat subgroups that are grouped. Also, the results  of system estimation showed that the groups had a negative intrinsic price elasticity.In the meantime, the price elasticity of groups livestock meat, birds and  fish meat are respectively equal to -0.89, -0.59 and  -0.77. This study suggest doing weak separability tests before each action on the demand system approach.  The separability of consumer desires is a necessary and sufficient condition for multi-stage budgeting and collectivization is consistent of commodity where costs are allocated between edible groups by price indices and intergroup allocations are made independently other groups. Given the high share of meat types (23 percent of household food and beverage expenditure) in the household budget and the important nutritional role of meat in people's health  to  determine the consumption pattern of meat products in Iran used to Rotterdam demand function in this study. In empirical studies of demand, the concept of separation is employed to correctly estimate demand function and limit the number of parameters. For this purpose, data of price index and cost of meat types (livestock, birds, fish) central Bank over the years 1995-2016 were used. The results of the separability tests support the hypothesis that a consumer first divide their income between 13 meat products in three groups (livestock, birds, fish) assigns and then approves the allocation action between the types of meat subgroups that are grouped. Also, the results  of system estimation showed that the groups had a negative intrinsic price elasticity.In the meantime, the price elasticity of groups livestock meat, birds and  fish meat are respectively equal to -0.89, -0.59 and  -0.77. This study suggest doing weak separability tests before each action on the demand system approach.  https://ijaedr.ut.ac.ir/article_82424_27cde9bacdde66bd0aa1ccad3a5d2211.pdf