Firm size‐specific trade effects of regional trade agreements: Estimating extensive and intensive margins of trade

We estimate the impacts of Korean firms’ participation in regional trade agreements (RTAs) on the extensive and intensive export margins by identifying exporting firms based on their firm size—small and medium‐sized enterprises (SMEs) and large enterprises (LEs) at the 5 399 HS six‐digit commodity level—and specifying characteristics of RTAs from 2004 to 2015. We apply the EK Tobit estimation technique to control zero trade and the OLS estimation with importer‐product and time fixed effects to alleviate the endogeneity problem. We find that firm size, product type, and depth of RTA significantly matter. Specifically, we find that deeper RTAs with larger, developing, and closer members significantly enhance the export creation effects of SMEs and LEs. Regarding the firm size‐specific effects, we find that SMEs are less sensitive to exploiting RTA participation but more sensitive to the import market size, bilateral and relative trade costs, and the RTA characteristics. LEs’ export creation is mainly driven by the intensive margin, while SMEs’ export creation is driven by extensive and intensive margins (slightly more by the extensive margin). For the product‐specific effects, we find that Korea's major exportable products such as chemicals, basic metals, motor vehicles, and transport equipment generate significantly strong export creation effects for both LEs and SMEs through their participation in RTAs.