I know it's not quantitative evidence, but this is a fun paper -
http://papers.ssrn.com/sol3/papers.cfm?abstract_id=1746343
"Intellectual property law has long been justified on the belief that
external incentives are necessary to get people to produce artistic
works and technological innovations that are easily copied. This Essay
argues that this foundational premise of the economic theory of
intellectual property is wrong. Using recent advances in behavioral
economics, psychology, and business-management studies, it is now
possible to show that there are natural and intrinsic motivations that
will cause technology and the arts to flourish even in the absence of
externally supplied rewards, such as copyrights and patents."
(via Groklaw)
- Rob.
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