Why Don't Inventors Patent?
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This paper argues that the ability to keep innovations secret may be a key determinant of patenting. To test this hypothesis, the paper examines a newly-collected data set of more than 7,000 American and British innovations at four world's fairs between 1851 and 1915. Exhibition data show that the
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美国国家经济研究局创建时间：
2007-08-01
