[4]Baumol, W. J. and Willig,R. D.,1981: Fixed Costs,Sunk Costs, Entry Barriers,and Sustainability of Monopoly, The Quarterly Journal of Economics, Vol.96,No.3.
[5]Baumol, W.J.,Bailey, E. E.,and Willig,R.D.,1977:Weak Invisible Hand Theorems on the Sustainability of Multiproduct Natural Monopoly, The American Economic Review,Vol.67,No. 3.
[6]Stigler,G.J.,1951:The Division of Labor is Limited by the Extent of the Market,Journal of Political Economy,Vol.59,No.3.
[7]Williamson,O.E.,1975:Markets and Hierarchies,NewYork: Free Press.
[4] Baumol, W.J. and Willig, R.D., 1981: Fixed Costs, Sunk Costs, Entry Barriers, and Sustainability of Monopoly, The Quarterly Journal of Economics, Vol.96, No.3.
[5] Baumol, W.J., Bailey, E.E., and Willig, R.D., 1977: Weak Invisible Hand Theorems on the Sustainability of Multiproduct Natural Monopoly, The American Economic Review, Vol.67, No.3.
[6] Stigler, G.J., 1951: The Division of Labor is Limited by the Extent of the Market, Journal of Political Economy, Vol.59, No.3.
[7] Williamson, O.E., 1975: Markets and Hierarchies, New York: Free Press.