A Theory of Knowledge Growth by Gianluca Carnabuci

By Gianluca Carnabuci

Why do convinced domain names of human wisdom strengthen speedier than others? This thesis units out to reply to this question by means of elaborating upon the thought that new rules spring from hybridizations of present rules. through the years, such hybridizations shape a path-dependent community constitution of interconnected and interconnecting wisdom domain names. This thesis develops a network-analytic method of version this constitution and to enquire its results. in response to all technological wisdom patented within the usa among 1975 and 1999, this thesis demonstrates that the community place an information area is embedded in at a given cut-off date impacts its next progress customers in vital and predictable methods.

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I. COMPARABILITY OF TRUNCATED DATA Comparisons of citation counts ought to take into account that patents granted at different points in time are subjected to differing degrees of truncation. 12, older patents have systematically higher chances to receive citations within the observation period. Therefore, a comparison of forward citation counts over time would yield biased conclusions, and the bias would increase with differences in patents’ age. An equivalent problem occurs when backward citations are analyzed.

3 Share of corporate patents by application year, US and non-US assignees Source: adapted from Hall et al. 4 Distribution of patents by technological area and application year Source: adapted from Hall et al. 5 Distribution of patents by technological area and application year, as a share of total patents Source: adapted from Hall et al. (2001) As I already discussed, the USPTO classifies each patent into one of 418 technological domains. In addition, the developers of the NBER database partitioned these domains (and the patents therein) into six macro technologyareas (Hall et al.

In the case analyzed here, to the isolates identified in any of the network cross-sections correspond only five domains. Moreover, the patterns of knowledge hybridization and production of these isolated domains are of negligible magnitude1. This suggests that analyses can focus on the giant component at no risk of overlooking noteworthy dynamics of knowledge growth, which is the strategy I adopt throughout this thesis. After excluding the five isolated domains, the population of domains of US-patented knowledge reduces to 413 units.

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