Data Appendix Available Online
Modeling the length and shape of the R&D lag: an application to UK agricultural productivity
Article first published online: 28 JUN 2008
© 2008 International Association of Agricultural Economists
Volume 39, Issue 1, pages 73–85, July 2008
How to Cite
Thirtle, C., Piesse, J. and Schimmelpfennig, D. (2008), Modeling the length and shape of the R&D lag: an application to UK agricultural productivity. Agricultural Economics, 39: 73–85. doi: 10.1111/j.1574-0862.2008.00316.x
A data appendix to replicate main results is available as part of the online article from: http://www.blackwell-synergy.com (this link will take you to the article abstract). Please note: Blackwell Publishing is not responsible for the content or functionality of any supplementary materials supplied by the authors. Any queries (other than missing material) should be directed to the corresponding author for the article.
- Issue published online: 28 JUN 2008
- Article first published online: 28 JUN 2008
- Received 17 July 2007; received in revised form 20 November 2007; accepted 31 March 2008
- Technical change;
- Agricultural innovation;
- Impact assessment
This article updates total factor productivity (TFP) growth in UK agriculture from 1953–2005 and shows that public and private research and returns to scale explain TFP. Cointegration and causality tests are used to investigate the validity of attempts to explain UK agricultural productivity with R&D and related technology variables. Then, the length and shape of the lag structures are modeled and compared with the structures that are commonly imposed on the data. The rates of return (ROR) to R&D using the data determined lags differ considerably from those obtained by imposing lag shapes. These comparisons show that the ROR to public R&D are sensitive to the lag shape as well as its length and that the omission of other technology variables, such as mechanical and chemical patents pertaining to agriculture and farm size can bias the ROR.