3Williamson, O. E. The Economic Institutions of Capitalism [M]. Beijing: China Social Sciences Publishing House, 1999: 52.
4Grossman S J, Hart O D. The Costs and Benefits of Ownership: A Theory of Vertical and Lateral Integration. Journal of Political Economy, 1986, (8): 691-719.
5Jensen M C, Meckling W H. Theory of the Firm: Managerial Behavior, Agency Costs and Ownership Structure. Journal of Financial Economics, 1976, (3): 305-360.