Trade in Intermediate Goods: Implications for Productivity and Welfare in Korea

There have been voluminous contributions such as Daudin et al. (2011), Johnson and Noguera (2012), Koopmans et al. (2010), and Trefler and Zhu (2010) in measuring value added trade based on input-output tables as generalizations of the vertical specialization measures following Hummels et al. (2001). These studies focused on trade in intermediate goods as a key feature of recent global trade. In the case of Korea, about 50% of total exports and 70% of its total imports are intermediate goods trade. This paper contributes to the discussion about the trade in intermediate goods and productivity by revisiting Basu (1995), Jones (2011), and Lee and Pyo (2007) to examine implications of trade in intermediate goods for macroeconomic business cycles and productivity and welfare at the current stage of Korean development. The major revision of the Basu (1995) model is attempted by decomposing intermediate goods into domestically produced intermediate inputs and imported intermediate inputs to investigate implications of the model in a small open economy. The major finding is that the procyclicality of the intermediate goods usage relative to labor usage and TFP changes in both value added and gross-output regressions are significantly weaker in a small open economy like Korea than the large economy of the United States. We also investigate the effects of misallocation and multiplier effects due to intermediate goods on industrial productivity and efficiency following the model of Jones (2011). Since the effects of misallocation can be intensified through the industrial input-output structure of the economy, we calculate the intermediate goods multiplier by Korea's 29 manufacturing industries. We find technical changes and the degree of inefficiency are related with the magnitude of multipliers, but we leave a fundamental identification problem to future research.