Tracing Value-Added and Double Counting in Gross Exports: Comment
评论Koopman等人（2014）提出的总出口增加值分解方法，基于“假设提取”框架给出更简洁的定义，并自然扩展到双边出口分解，对研究贸易增加值核算的学者有参考价值。
In a recent contribution to the AER, Koopman, Wang, and Wei (2014) proposed a decomposition of a country's gross exports into value-added components and double-counted terms. It is motivated by complex manipulation of basic accounting identities. In this comment we provide an alternative framework based on “hypothetical extraction.” This parsimonious approach provides a clear definition of domestic value added in exports and has a natural extension into decompositions of bilateral export flows.