David Rotman has authored an excellent article titled, “How
to Measure the Returns on R&D Spending: Forget the Glorious Successes of
Past Breakthroughs—the Real Justification for Research Investment is What We Get
for Our Money. Here’s What Economists Say” in the MIT Technology Review. The article does a nice job explaining recent
research concerning public funding of R&D and the return on investment to
the public. The article notes that many
questions are not answered. The article
is available, here.