CAJ | 학술논문

引力方程是一个被广泛采用的实证工具，其理论基础和估计方法一直是国际贸易领域的重要问题。理论方面，近来研究表明不同的贸易理论能推导出结构相似但比较静态含义不同的引力方程。实证方面，零贸易和内生问题的发现，使得传统估计方法不再适用。包括PPML和Heckman选择模型在内的许多新方法被提出并采用。
인력방정시일개피엄범채용적실증공구，기이론기출화고계방법일직시국제무역영역적중요문제。이론방면，근래연구표명불동적무역이론능추도출결구상사단비교정태함의불동적인력방정。실증방면，령무역화내생문제적발현，사득전통고계방법불재괄용。포괄PPML화Heckman선택모형재내적허다신방법피제출병채용。
Gravity equation is frequently used as an empirical tool. Its theoretical foundation and estimation methods have always been an important topic in the field of international trade. On the theoretical part, the recent studies find that similar gravity equations with dissimilar comparative static implications can be derived from different trade models. On the empirical part, traditional estimation methods perform poorly as a result of the occurrence of the problem of zero trade and endogeneity. Some new methods including PPML and Heckman selection model have been proposed and used. This paper aims to summarize and review the recent developments in this field.