Agreed. You could say that public libraries have a natural limit to their degree of sharing, whereas online filesharing does not. For instance, when a popular

Agreed. You could say that public libraries have a natural limit to their degree of sharing, whereas online filesharing does not. For instance, when a popular book comes out the library might have a couple copies. If hundreds want to read those copies then they'll have to wait. Many of those people will be unwilling to wait and buy the book instead, which supports the author.