selling singles (update)

["Okerson, Ann" <ann.okerson@yale.edu>]

Thanks to the many who replied for confirming my sense that 
selling of individual articles is commonplace.  I asked because I 
heard privately of a publisher who found it hard to do that. 
Perhaps the question I should ask is "what *would* make it hard 
to sell individual articles?"  Are materials published 5-50 years 
ago when authors' agreements did not include authors' rights a 
problem?  Are there any steps a publisher should take to make 
sure that a generous policy of making material available is 
sustainable?

With thanks,
Ann Okerson