چکیده:
In this study, we estimate a complete demand system for Iran that emphasizes main groups demand, using the CBS differential demand system specification. The results of this study, indicated that the expenditure elasticity of "Furniture and upholstery" and "Transportation and communication"groups are greater than one, and expenditure elasticity of "Housing group"; "Hygiene and medical care " and "Clothing and Footwear " lesser than one. Also, the lowest compensated own-price elasticity and the lowest uncompensated own-price elasticity are found for Food and for "Clothing and Footwear", respectively. From the compensated cross-price elasticities view point, some groups are Allen-Hicks complements, although the values of elasticities are small (For example Hygiene and medical care and Food)
خلاصه ماشینی:
"Table 1: numerous specifications of differential demand systems Model Functional Form description Dependent Variable Rotterdam Presents the average budget of commodity,and are quantity and price of good respectively, , and m is total expenditure.
The absolute-price version of the Rotterdam model, developed by Theil (1965), is expressed as: Where represents the average budget share of commodity; and are quantity and price of good , respectively, is treated as change in consumer’s behaviour in good, is the marginal propensity to consume , is total expenditure; and is the Divisia volume index which can be expressed as: The marginal shares and Slutsky coefficients were treated as constants.
Table 3: Geometric mean of Budget share in 1974-2008 Other consumption Clothing and Footwear Food Furniture and upholstery Hygiene and medical care Housing Transport and communication Main groups 0.
Table 4: Expenditure elasticities under Homogeneity and Symmetry based on CBS model Clothing and Footwear Transport and communication Furniture and upholstery Hygiene and medical care Housing Food Main groups -0.
Table 5: Compensated Price Elasticity () under Homogeneity and Symmetry in CBS model Food Clothing and Footwear Furniture and upholstery Hygiene and medical care Housing Transport and communication Food -0.
Table 6: Uncompensated Price Elasticity () under Homogeneity and Symmetry in CBS model Food Clothing and Footwear Furniture and upholstery Hygiene and medical care Housing Transport and communication Food -0.
2) Expenditure Elasticity under Homogeneity and Symmetry restrictions in the CBS model indicate that "Furniture and Upholstery" and "Transportation and Communication "groups are luxury and "Housing"," Hygiene and Medical Care " and "Clothing and Footwear"groups are necessary."