the effective factors on iran's tea supply (case study: gilan province)

abstract the purpose of this paper is estimation of the effective factors on tea supply in gilan province by using time series data during 1360-1390 in the form of nerlove model. according to the results, explanatory variables of the model could describe 97 percent of dependent variable (product supply) changes. the results show that the guaranteed price index of green tea leaf with elasticity 0/81 has more sensitive. in addition, tea supply with a lag and having elasticity 0/60, as well as, technology with elasticity 0/14 are the most effective factors on tea supply. due to the elasticity coefficient of tea imports and the amount of rainfall, which are -0/024 and 0/029 respectively, these two variables did not affect the tea supply significantly.