Lessons from patents
Subtitle: using patents to measure technological change in environmental models
By: David Popp.
Contributors: National Bureau of Economic Research.
Series: NBER working paper series -- no. 9978.; Working paper series (National Bureau of Economic Research) -- working paper no. 9978.
Publisher: National Bureau of Economic Research
Published: 2003
Place of publication: Cambridge, Mass
Language: eng
Number of pages: 31
Subjects: Technological innovations; Technology and state; Patents; Environmental policy
Notes: "September 2003."

Includes bibliographical references.

Also available in PDF from the NBER world wide web site (www.nber.org).