《Table 2:Descriptive Statistics of Primary Variables after Matching》

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《How China's Grain-for-Green Project Contributes to Farmers' Income Growth》

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To ensure that the treatment group and control group share a common secular trend without policy intervention，this paper first conducts a PSM of the samples.In conducting PSM，we matched various indicators of GGP household at last year before participating the project with the data of non-GGP household at the same time.For example，if a household who participated in the GGP in 2007，their various indicators at year of 2006 are matched with the data of non-GGP farmers at the year of 2006.We followed the method of radius matching.By configuring a relatively rigorous radius value，we enhanced the homogeneousness of the samples.This paper controls the matching radius at 0.00001，and matched6，406 households，less than 20%of the total samples.Meanwhile，this paper conducts a balance test of the matching results8.After matching，the composition of samples in various years is shown in Table 1.