membership heterogeneity and growth path of farmers' cooperatives in China 合作与发展：成员异质性与农民合作社成长路径研究：membership heterogeneity and growth path of farmers' cooperatives in China Development and role of farmers' cooperatives in China Genesis, governance, and efficiency of farmer cooperatives in China 并列题名：Development and role of farmers' cooperatives in China 并列题名：Genesis, governance, and efficiency of farmer cooperatives in China