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Internal and External R&D: A Sample Selection Approach
The study explicitly takes into account that the decision to enter into an external research and development (R&D) relationship is related to an antecedent decision to carry out R&D. Based on a sample of Italian manufacturing firms, the results confirm the need to consider explicitly the selectivity issue in the empirical analysis of external R&D.
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Available for purchase at: http://papers.ssrn.com/sol3/papers.cfm?abstract_id=573035