Durability, Market Structure, and New-Used Goods Models S. J. Liebowitz American Economic Review 1982 72(4), 816-824
Copying and Indirect Appropriability: Photocopying of Journals S. J. Liebowitz Journal of Political Economy 1985 93(5), 945-957
Journals as Shared Goods: Comment S. J. Liebowitz; Stephen E. Margolis American Economic Review 1982 72(3), 597-602
Copying and Indirect Appropriability: Photocopying of Journals Stan J. Liebowitz Journal of Political Economy 1985 93(5), 945-957