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اقتصاد::
خوشه فناوری
Following Akcigit and Kerr (2015), each innovation belongs to a technological cluster, and there exist two types of technological advances: follow-up and major advances.
Each patent within a technological cluster is assumed to cite all the previous innovations in the same cluster with some positive probability.
Once a new major innovation creates a new technological cluster, the cluster that it replaces receives no more citations.
I > 0, external innovation can either be a follow-up within an existing technological cluster, or be a major advance and create a new technological cluster altogether.
a technological cluster ages.
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