Source: Adams J. (2007) ‘Scientific wealth and the scientific investments of nations’, in T. Galama and J. Hosek (eds.) Perspectives on U.S. Competitiveness in Science and Technology, Santa Monica, CA: Rand Corporation, p. 40. [via the Scout Report]
Note 1: PUBERD = public R&D as a share of GDP.
Note 2: See a review of the report, and especially Adams’ chapter, in IntelliBriefs.