摘要翻译：
虽然引力方程最初是作为一种完全经验的关系来解释两个伙伴之间的贸易量，但它一直是几个试图解释引力方程的理论模型的焦点。专业化模型为双边贸易中的重力方程提供了坚实的理论基础。一些研究试图通过在模型中加入不完全专业化来改进专业化模型，但我们认为这是不必要的复杂。本文基于贸易性现象提出了一个完善的专业化模型，该模型克服了初始值较简单的问题。通过对40个国家10年来双边贸易的面板数据的估计，我们提供了支持理论模型的经验证据。实证结果表明，可交易性是数据偏离基本完美专业化模型的唯一原因。
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英文标题：
《A Perfect Specialization Model for Gravity Equation in Bilateral Trade
  based on Production Structure》
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作者：
Majid Einian, and Farshad Ranjbar Ravasan
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最新提交年份：
2018
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分类信息：

一级分类：Economics        经济学
二级分类：Econometrics        计量经济学
分类描述：Econometric Theory, Micro-Econometrics, Macro-Econometrics, Empirical Content of Economic Relations discovered via New Methods, Methodological Aspects of the Application of Statistical Inference to Economic Data.
计量经济学理论，微观计量经济学，宏观计量经济学，通过新方法发现的经济关系的实证内容，统计推论应用于经济数据的方法论方面。
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一级分类：Quantitative Finance        数量金融学
二级分类：General Finance        一般财务
分类描述：Development of general quantitative methodologies with applications in finance
通用定量方法的发展及其在金融中的应用
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英文摘要：
  Although initially originated as a totally empirical relationship to explain the volume of trade between two partners, gravity equation has been the focus of several theoretic models that try to explain it. Specialization models are of great importance in providing a solid theoretic ground for gravity equation in bilateral trade. Some research papers try to improve specialization models by adding imperfect specialization to model, but we believe it is unnecessary complication. We provide a perfect specialization model based on the phenomenon we call tradability, which overcomes the problems with simpler initial. We provide empirical evidence using estimates on panel data of bilateral trade of 40 countries over 10 years that support the theoretical model. The empirical results have implied that tradability is the only reason for deviations of data from basic perfect specialization models.
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PDF链接：
https://arxiv.org/pdf/1803.09935