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A higher fragmentation of patent ownership following the recent U.S. pro-patent shifts has built overlapping property rights or patent thickets for firms with cumulative innovations. This has made the use of other firms' innovations costlier, due to higher transaction costs, licensing fees, and...
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Patent thickets are sets of overlapping intellectual property rights that occur in fragmented technology markets. Their potential impacts on innovation have become an increasing concern in recent years. I estimate the direct and indirect effects of patent thickets on market value of publicly...
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