Larry Lessig, Thomas Hazlett, Richard Epstein, Edward Welbourne and Frank Walker weigh in on copyright, stimulating and stifling innovation, the increasing costs to innovation brought by extending copyright. Welbourne discusses an interesting idea: the net present value of a copyrighted work at the time of sale to a publisher, verses the value after each 20 year extension, diminishing over time, which eventually is worth less than 1%. He proposes that copyrighted works go into the public domain, as averaged within a specific category, after the value of works diminish to 1%. It would require an economist to figure it out, but they've got to do better than Congress at this point.

For more on the percents, the economist's amicus brief in Eldred.