《Table 1 Comparison of maize net profits in MPMs and PPs (yuan/mu, constant price in 2000)》

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《中国山区耕地利用边际化过程机理——基于成本和收益变化的分析（英文）》

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By comparing the per mu net profit of every province and municipality in 2004 and 2013，we find that both MPMs and PPs’per mu net profits show a downward trend，but the decline in the MPMs was greater than that in the PPs.Except for Shanxi，all MPMs’per mu net profit dropped drastically.The average per mu net profit in Chongqing，Guizhou，Yunnan，Shaanxi，and Gansu even dropped below zero，which is in sharp contrast to PPs（Table 1）.