Impacts of Government Supporting Policies on Wheat Supply, Cropping Area and Yield in Iran: Application of Autoregressive Distributed Lag Model
Subject Areas : Agricultural Economics ResearchF. Taheri 1 , S. Yazdani 2 , H. Mohammdi 3
                                               1 -     مربی اقتصاد کشاورزی دانشگاه آزاد اسلامی مرودشت
                                               
                                               2 -     دانشیار گروه اقتصاد کشاورزی دانشگاه آزاد اسلامی واحد علوم و تحقیقات تهران
                                               
                                               3 -     استادیار اقتصاد کشاورزی دانشگاه آزاد اسلامی جهرم
                                               
                                       
Keywords: wheat, Nominal protection rate, autoregressive distributed lag Model, Mark Nerlove Model,
Abstract :
                                                            In this study impacts of government intervention on supply, 
yield and cropping area of wheat was investigated using nominal 
protection rate. The data set applied in the study was obtained from 
different sources such Ministry of Statistical Yearbook and FAO 
website for period of 1353-1384. After testing data stationary and 
calculating the nominal protection rate, the impact of supporting 
policies was studied using ARDL approach and Nerlove model. The 
results of the study showed that nominal protection rate was negative 
during the study period, indicating that not only wheat producers were 
implicitly taxed. The negative support tends to decrease slowly during 
the period . Wheat real price did not show considerable impact on 
wheat supply in the short run. While in the long run wheat real price, 
technological change and cropping area revealed a positive impact on 
wheat supply. The results also showed that while nominal protection 
rate had no impact on cropping area , it is affected by lagged cropping 
area. 
                                                    

 
                                    