Ben Groom, Phoebe Koundouri, Ekaterini Panopoulou, and Theologos Pantelidis, "Discounting the Distant Future: How Much Does Model Selection affect the Certainty Equivalent Rate?", Journal of Applied Econometrics, Vol. 22, No. 3, 2007, pp. 641-656. The data for the US interest rate over two centuries used in the article were provided to us by R. G. Newell. These data were analyzed in R. G. Newell and W. A. Pizer (2003), "Discounting the distant future: How much do uncertain rates increase valuations?", Journal of Environmental Economics and Management, Vol. 46, pp. 52-71, The data set consists of annual observations of U.S. market interest rates for long-term high-quality government bonds. The series span 1798-1999. Real interest rates were created by subtracting, after 1950, a measure of expected inflation using the Livingston survey of professional economists. A full description of the data sources and methods is given in Newell and Pizer (2003, pp. 61-62). An even more detailed description is also provided in R. G. Newell and W. A. Pizer (2000, "Discounting the distant future: How much do uncertain rates increase valuations?" RFF discussion paper 00-45, Washington, DC, pp. 13-14 & pp. 39-43. By the same route, we obtained the estimates of the marginal damages in future years from an extra ton of emissions in the year 2000 which were utilised in the Cost Benefit Analysis (CBA) (Section 4). These are confidential data files. Requests for access to these files should be directed to Richard G. Newell Resources for the Future 1616 P St NW, Washington, DC 20036, USA Please address any questions to Ekaterini Panopoulou e-mail: apano [AT] nuim.ie Alternative e-mails : Ben Groom: bg3 [AT] soas.ac.uk Phoebe Koundouri: pkoundouri [AT] aueb.gr Theologos Pantelidis: tpantelid [AT] yahoo.com