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英文文献：Improvement of GTAP Cropland Constant Elasticity of Transformation Nesting Structure-改进GTAP农田固定弹性改造筑巢结构
英文文献作者：Li, Liang,Taheripour, Farzad,Preckel, Paul V.,Tyner, Wallace E.
英文文献摘要：
This paper suggests a new approach to econometrically estimate parameters of multi-level Constant Elasticity of Transformation (CET) functional forms which are widely used in developing Computable General Equilibrium (CGE) models. An illustrative CET functional form is estimated using the proposed method based on historical data taken from the U.S. economy for the time period of 1996-210 to evaluate the performance of the new method. The proposed estimation process may be used to improve the existing cropland frontier used in GTAP-BIO model. Currently, the cropland frontier in GTAP-BIO model supplies land to different crops using a simple one-level CET function due to the lack of empirically estimated more flexible functional forms. The proposed method provides an opportunity to estimate more flexible multi-level CET functional forms according to available historical data. This will help to change the land supply side of the GTAP-BIO model based on historical observations.
摘要本文提出了一种新的计量估计多层常弹性变换函数形式参数的方法，该方法广泛应用于可计算一般均衡模型的建立。利用基于1996-210年间美国经济历史数据的方法估计了说明性CET函数形式，以评估新方法的性能。所提出的估计过程可用于改进现有的GTAP-BIO模型中的农田边界。目前，由于缺乏经验估计的更灵活的函数形式，在GTAP-BIO模型中，农田前沿使用简单的一级CET函数向不同作物提供土地。该方法提供了一个机会，以估计更灵活的多层次四六级函数形式，根据现有的历史数据。这将有助于改变基于历史观察的GTAP-BIO模型的土地供应方面。
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