@techreport{NBERw6101,
 title = "R&D and Productivity: The International Connection",
 author = "Elhanan Helpman",
 institution = "National Bureau of Economic Research",
 type = "Working Paper",
 series = "Working Paper Series",
 number = "6101",
 year = "1997",
 month = "July",
 URL = "http://www.nber.org/papers/w6101",
 abstract = {Countries differ greatly in R&D spending, and these differences are particularly striking when comparing developed with developing countries.  The paper examines the extent to which the benefits of R&D are concentrated in the investing countries.  It is argued that significant benefits spill over to other countries in the world.  The argument is supported by quantitative estimates of such cross-country effects.},
}