Input Trade Liberalisation, Institution and Markup: Evidence from China's Accession to the WTO

This paper investigates the effects of input trade liberalisation on firm markups and assesses how institutional environment affects such impacts by using Chinese firm‐level data. To identify the causal effects, we exploit the quasi‐natural experiment of China's WTO accession in 2001 and perform difference‐in‐differences estimation. The results show that input tariff liberalisation leads to a substantial increase in firm markups, and institutional environment significantly strengthens such an impact. We further uncover the underlying mechanisms through which input tariff liberalisation boosts firm markups, and show that both price and cost channels work for the input tariff cut effect on firm markups, of which the latter is much more important. In addition, we also demonstrate that input tariff cut significantly fosters aggregate markup growth, and the reallocation effect is found to be an important channel through which input tariff liberalisation boosts aggregate markup growth.