8Richardson, S. Over-investment of free cash flow [J]. Review of Accounting Studies, 2006,(1):159-189.
9Scharfstein D.S.& Stein J.C. The dark side of intemal capital market: Divisional rent-seeking and inefficient investment [J].Joumal of Finance, 2000,55(5):2537-64.
10Stephen C.V. The Cash Flow Investment Relation-ship: Evi- dence Form U.S. Manufacturing Firms [J].Financial Management,1994, 23(2):198-226.