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Much work on technological change agrees that the combination of new and existing technological capabilities is one of the principal sources of inventive novelty, and that there have been instances in history when new inventions appear with few antecedents. The many discussions across research communities regarding the relative roles of combination and origination as sources of technological novelty have not provided much in the way of formal identification and quantification. By takingdoi:10.1016/j.respol.2015.05.008 fatcat:gaoipkpqhbcxbhmbe54ljp3iqe