关键词: 单位要素成本 , 加总生产率 , 资源错配 , 福利损失

Abstract: We extend productivity decomposition model of Petrin et al by introducing unit factor cost，and obtain a more accurate reallocation effectEmpirical results calculated with Chinas abovescale industrial firm data (2000—2007) suggest that，during the sample period，technical effect and aggregate distortion explain most of aggregate productivity growth，while reallocation effect only contributes 324% and comes to near zeroHowever，welfare loss from misallocation accounts for about 2663% of manufacturing value addedThese evidences indicate that its next to impossible to improve allocation depends only on market mechanism under existing system，and the economic structure seems to be unchangeable Further reallocation should come from the reform of existing economic structure，which helps alleviate misallocationFinally，we compute the potential of reallocation in each region，and thus provide a quantitative reference for the optimization of regional structure

Key words: unit factor cost , aggregate productivity growth , misallocation , welfare loss