نویسنده: sahedi، davood؛
پاییز 1385 - شماره 17 ISC (10 صفحه - از 149 تا 158)
This paper represents static and dynamic specifications of the Almost Ideal Demand System (AIDS) based on cointegration techniques and error correction models. Based on Iranian urban-area’s household expenditure data over the period 1984-2004, it was found that the proposed formulation for dynamic specification performs well on both theoretical and statistical grounds as the theoretical properties of homogeneity and symmetry are supported by the data. Moreover, with computing short- run and long-run elasticities, it was found that food, clothing and housing are complements, regardless of time horizon.خلاصه ماشینی:
"Abstract This paper represents static and dynamic specifications of the Almost Ideal Demand System (AIDS) based on cointegration techniques and error correction models. Based on the time series properties of the data and as long as cointegration between the dependant and a linear combination of independent variables is ensured, an ECM for the AIDS can be established and ______________________________ * M. Besides implementing an ECM-AIDS, in the applied counterpart, the paper provides empirical evidence and measures of short- and long-run elasticity for household expenditure demand in urban areas of Iran over the period 1984-2004. In order to be able to formally assess whether the long-run demand relationships are economically meaningful or merely spurious, First of all it is necessary to investigate the time-series properties of data used in Eq. According to the result reported in the table 3 all budget-share are cointegrated with group prices and real expenditure at a 1% significance level. Cointegration ensures that shocks affecting group prices or real expenditure will be reflected on different expenditure shares in a similarly way showing that these variables are moving together in the long-run. 5- Conclusion This paper represents both dynamic and static specifications of the AIDS based on recent developments on cointegration techniques and error correction models. The proposed model has also the ability to provide estimates of both short- and long-run demand elasticities, a feature that significantly enlarges the alternatives for policy simulations."
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