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Re:Mickey Mouse and Batman will soon be public domain by majewsky on Tuesday January 01, 2019 @07:21PM (#18803296)
I recall reading a study (years ago, so do not have a link at hand) that considered externalities of copyright and concluded that about 10-15 years would be a reasonable tradeoff between creators' and society's interests.

10-15 years after publication, though, not after death. Also, nonrenewable.

Re:Mickey Mouse and Batman will soon be public domain by readbeard on Wednesday January 02, 2019 @01:20AM (#18804534)
Is this the paper to which you are referring? https://rufuspollock.com/papers/optimal_copyright_term.pdf