Comparative Advantage and Biased Gravity
Comparative Advantage and Biased Gravity
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比较优势和偏重
DOI：
10.2139/ssrn.2913921
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
S. French
中科院分区：
文献类型：
--
作者：
S. French
基于部门一级贸易数据的引力估计通常是错误的，因为它忽略了产品一级的比较优势在形成贸易壁垒对部门一级贸易流动的影响方面的作用。使用一个模型，允许任意模式的产品层面的比较优势，我表明，部门层面的贸易流量遵循广义引力方程，其中包含一个不可观察的，双边的组成部分，与贸易成本和标准的部门层面的引力模型省略。我提出并实现了一个估计，使用产品级的数据占比较优势的模式，并发现在部门级估计的偏差是显着的。我还发现，当控制产品层面的比较优势，估计是更强大的分布假设，这表明剩余的偏见，由于异方差和样本选择是不那么严重，比以前认为的。
Gravity estimation based on sector-level trade data is generally misspecified because it ignores the role of product-level comparative advantage in shaping the effects of trade barriers on sector-level trade flows. Using a model that allows for arbitrary patterns of product-level comparative advantage, I show that sector-level trade flows follow a generalized gravity equation that contains an unobservable, bilateral component that is correlated with trade costs and omitted by standard sector-level gravity models. I propose and implement an estimator that uses product-level data to account for patterns of comparative advantage and find the bias in sector-level estimates to be significant. I also find that, when controlling for product-level comparative advantage, estimates are much more robust to distributional assumptions, suggesting that remaining biases due to heteroskedasticity and sample selection are less severe than previously thought.
影响因子：
3.3
作者：
Natalie Chen;D. Novy
通讯作者：
Natalie Chen;D. Novy
影响因子：
8.2
作者：
Allen, Treb;Arkolakis, Costas;Takahashi, Yuta
通讯作者：
Takahashi, Yuta