5Bakos J Y. Reducing buyer search costs:Implications for electronic marketplaces [ J ]. Management Science, 1997,43 (12) : 1676-1692.
6Brynjolfsson E, Smith M D. Frictionless commerce? A comparison of Internet and conventional retailers [ J ]. Management Science, 2000,46(4) :563-585.
7Smith M D, Bailey J, Brynjolfsson E. Understanding digital markets : Review and assessment [ M ]. Massa- chusetts : MIT Press, 1999:434-452.
8Morton F S, Zettelmeyer F, Risso J S. Internet car retailing [ J ]. The Journal of Industrial Economics, 2001,49(4) :501-519.
9Friberg R, Ganslandt M, SandstrSm M. E-commerce and prices : Theory and evidence [ R ] . Stockholm : Stockholm School of Economics, 2000.
10Brown J R, Goolsbee A. Does the Internet make mar- kets more competitive 9. Evidence from the life insur- ance industry [ J ]. Journal of Political Economy, 2002,110(3) :481-507.
