Results reveal that benefit affiliating is the internal motivation to promote the UC cooperative stability,and the UC provides economic and socialized motivations for its members,which enhances the agricultural organizational degree,decreases transaction cost,increases profit spaces,and avoids some unstable circumstances such as withdrawals of UC members. Selective motivation is the safeguard measure of UC＇s stability. With the scale expansion of UC,when the organization cost is greater than the profit,the UC will choose to reduce its social s...
