Authors' calculation based on the 2005 1% Population Sampling Survey. When including migrants in the analysis, the inequality index is slightly reduced, which is evidenced by a smaller GE (2) in the last two groupings compared to the first. Both categorisations are of relevance. The second grouping is based on the hukou definition, which reflects the institutional differences between urban and rural residents. In this case, rural-urban inequality explains about 10% of overall inequality. The final grouping is based on the definition of residence that has been used by the NBS to define the urban population since 2000.