جستجوی مقالات مرتبط با کلیدواژه « سیستم تقاضای تقریبا ایده آل » در نشریات گروه « علوم اجتماعی »

Dressing and preparing suitable clothing is one of the indicators and superiority of humans. Since women play an essential role in the various relationships of every society, in other words, all social, cultural, political and economic programs will achieve the desired result with their performance and support; Therefore, choosing the type of their cover is of particular importance. Because hijab has a special place in the religion of Islam and Iran as an Islamic country, and in addition, it has significant economic and cultural effects on the social life of individuals. One of the ways to investigate the place of hijab in the society is to investigate the behavior of consumers. The utility function reflects the consumption behavior and preferences of consumers, and by using it, it becomes possible to analyze the individual's demand structure. In this regard, the analysis of the demand structure and household consumption pattern is very important for the goals of economic activists, so that the policy makers and planners use its results to predict the future situation and finally, by evaluating the past policies, it is the basis for detailed planning. It will be provided for them for favorable conditions in the future. On the other hand, producers and other market agents need to forecast demand in order to plan and design their production and sales, and demand elasticity is important for this reason. In this study, using data from the period 1990 to 2020, the model of an almost ideal demand system for four types of hijab goods - black veil, cotton cloak, mantle, scarf and shawl - in Iran using the panel data method as a single equation and A system is estimated. The results of this study show that according to the criterion of good fit, the system model has a higher explanatory power. Based on the single-equation estimation, the elasticity of cotton tent, black tent, coat, scarf and mask was equal to 6, 22.04, 18.25, and 25.62, respectively. The estimation of the system model in terms of the significance of the coefficients is the same as the single-equation model. According to the system model, the income elasticity of the cotton tent, black tent, coat, scarf and mask is equal to 6.33, 17.56, 18.44, and 19.32, respectively. The elasticity and sign of the coefficients of Manto are substitutes for the black veil and the cotton veil and have a complementary relationship with the other hijab products mentioned in this research. The black chador has a complementary relationship with the cotton chador and the shawl and scarf. Based on the obtained results, both the systematic estimate and the single-equation estimate have a positive income elasticity, which indicates that with the increase in people's income, they go for higher and higher-quality hijab goods, which causes an increase in the share of expenditure on goods. It becomes a veil. By comparing the elasticities in both estimations, it can be concluded that the share of expenditure on hijab, headscarves and masks is more sensitive to income changes.

Inrtoduction:

 Macroeconomic instability, exchange rate volatility, high inflation and consequently rising food price have been critical issues in recent years in Iran’s economy. Policy inefficiencies, policy inconsistency, and food price fluctuations have affected vulnerable households and low-income groups and increased food poverty, undernourishment and malnutrition. The study of income and price elasticities of food items, especially in different income groups, provides valuable information for policy making.

This research, using the approach of the almost ideal demand system, studies the elasticity of food items in the household consumption budget for 2016 and 2018 and compares different income groups. The household income and expenditure from raw household survey data for the years 2016 and 2018. Due to the heterogeneous impact of price changes on demand in different income groups, the study was conducted on different income quantiles. In this respect, we focused on meat, bread, and dairy item.

Results show that bread is identified as an inelastic good and dairy and meat as elastic goods for low-income groups. The results of quantile analysis show that in 2018, bread was a Giffen good for the first quantile and necessary good for the third and the fifth.

The results indicate that the consumption of animal protein and dairy products is highly sensitive to the price of these goods. An increase in the price of these goods will limit the consumption of these micronutrients in the household food basket or possibly eliminate it in the low-income groups.

This paper estimates the energy demand systems in transportation and housing sectors in Iran over the period 1997-2006. Then, ignoring energy subsidies, calculates the changes in social welfare. This paper uses Almost Ideal Demand System (AIDS) and compensating variation (CV) for estimating the energy demand systems and calculating the changes in social welfare in terms of ignoring energy subsidies and increasing energy prices up to the level of international prices (shadow prices) respectively. The share of energy expenditures from total expenditures in transportation sector for middle deciles is higher and for richer deciles is less than other deciles. In housing sector, whenever the level of welfare increases, this share decreases. The results show that, the variance of energy in energy basket, may decrease the amount of compensating variation, and as a whole compensating variation of richer expenditure deciles are greater.

The demand and consumtion of cultural products in Iran including movies and going to cinema will rise in future because average economic growth rate in recent years in Iran has been 5 present and this means the demand for going to cinema will rise in future and since government protects movie making and distribution in Iran and pay them benefits or independenty act in this area, the studay of factors influencing household demand and income and price elasticities, and price of related products will help policy makers to respond to increasing demand for cinema and provide facilities and conditions to meet futurer demands. In this article we use the Almost Ideal Demand System, proposed by Deaton and Muellbauer (1980) to estimate household demand for cinema. The main reason why Almost Ideal Demand System is used is for its simplicity which enable researchers to test homogencity or heterogenity restrictions and symmetries.The provinces under study are:1- Booshehr; 2- Kohgilooyeh va Boyrahmad; 3- ChaharMahalo Bakhtiary; 4- Isfahan; 5- Ilam; 6- Fars; 7- Ghazvin; 8- Gilan; 9- Hamedan; 10- Hormozgan; 11- Kerman; 12- Kerinanshah; 13- Khorasan, 14- Kurdistan; 15- Lorestan; 16- Markazi; 17- Mazandaran; 18- Semnan; 19- Sistan; 20- Tehran; 21- Yazd; 22- Zanjan; 23- Eastern Azerbaijan; 24- Western Azerbaijan. In this article the demand functions for going to cinema, in different provinces, are estimated, based on the statistics and data pertaining to household expenditures. Considering different formulas of price and income elasticity, the price and income elasticity calculated for all different provinces. According to the obtained resultants, with exception of Isfahan, Hormozgan, Kerman, Kurdistan, Mazandaran and Eastern Azerbaijan, the price elasticity is less than one, which means demand is not sensitive to the price variations. The same elasticity for the entire country is -0.91 which is the almost equal to one and shows low elasticity of the commodity in household consumption. The amount of the elasticity shows that in case of a 100% increase in the ticket price for cinema, keeping other factors constant, demand for going to cinema would be decreased by 91 percent. Cross elasticity of price for journals and cinema in 9 provinces of Kohgilooyeh va Boyrahmad, Chahar Mahalo Bakhtiary, Isfahan, Ilam, Fars, Gilan, Hamedan, Yazd and Zanjan are negative, which means these two commodities could substitute each other in consumption. But, in other provinces the elasticity is positive; that means these two commodities complement each other in consumption. The important point is that in both states the absolute value of the elasticity is very small and almost zero that means the relation between journals and cinema is very weak. The same elasticity for the entire country is -0.12 that means in the country, in general, two commodities of cinema and journals substitute each other in consumption. In fact, if the journal price is increased by 100%, the demand for cinema is reduced by 11%.Crossed elasticity of price between book and cinema, in every province, is negative. This means in all the provinces these two commodities substitute for each other. This elasticity for provinces of Chaharmahalo Bakhtiary, Isfahan, Fars, Gilan, Hamedan, Kurdistan, Lorestan, Tehran and Zanjan is more than other provinces. The amount of the cross elasticity between the two commodities in demand function of cinema in the entire country is almost -47% that shows if book price increases by 100% and all other factor are kept constant, demand for cinema will decrease by 47%. In other words these two goods are complementary in consumption.The income elasticity in each of the provinces is positive; it is between zero and one. The income elasticity expresses the degree of sensitivity of demand in proportion to variations in household income. The amount of income elasticity for this commodity in the entire country is equal to 0.57 that means if income of a household increases by 100%, demand for this commodity would increase by 57%. On this basis, this is a necessary commodity and if the household income increases, the expenditures for cinema would increase by a lesser amount. Noting income elasticity of household demand for cinema and the average growth rate in recent years ahead, it is forcasted that the following income rise of about 2.1 times, (170 percent growth of incomes), demand for cinema will rise 96.9 percent (about 2 times) in fact, if government and policy makers want to meet this increase in demand, it is necessery to develop and increase cinemas and related facilities and conditions.