[ Thanks to Glen
for this link. ]
A study by economists from Tel Aviv University and the
Centre for Economic Policy Research (CEPR) titled ‘Open source
software: Motivation and restrictive licensing'[1] (pre-print)
looks at the productivity of developers on Open Source projects and
concludes:“‘…that the output per contributor in open source projects is
much higher when licenses are less restrictive and more
commercially oriented…'”