Key points are not available for this paper at this time.
Journal Article Innovation and Learning: The Two Faces of R & D Get access Wesley M. Cohen, Wesley M. Cohen Carnegie Mellon University Search for other works by this author on: Oxford Academic Google Scholar Daniel A. Levinthal Daniel A. Levinthal Carnegie Mellon University Search for other works by this author on: Oxford Academic Google Scholar The Economic Journal, Volume 99, Issue 397, 1 September 1989, Pages 569–596, https://doi.org/10.2307/2233763 Published: 01 September 1989
Cohen et al. (Fri,) studied this question.