Evaluating the impact of preferential trade agreement on fishery imports: An application of difference‐in‐differences with matching method
使用匹配的双重差分方法，评估了优惠关税方案对OECD国家渔业产品进口的平均处理效应，发现对冷冻黄鳍金枪鱼和新鲜长鳍金枪鱼进口有正向效应，但也存在负向效应，表明部分国家未充分利用优惠关税。
Abstract The purpose of thisstudy is to investigate the average treatment effect of the preferential tariff scheme at the HS 6‐digit level on the imports of fishery products between each OECD country and the world. The estimated results by employing a difference‐in‐differences with matching method show statistically positive average treatment effects for imports of frozen yellowfin tuna (HS030342) and fresh long‐finned tuna (HS030231) in many countries. However, there are also several negative average treatment effects on imports, implying that several OECD countries do not utilize preferential tariff schemes with exporter countries with sufficient productivity. This study fills the gap in the literature by providing more rigorous insights in the discussion regarding the trade creation/diversion effect of preferential trade agreements (PTAs).