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Linking by degrees : incremental alignment of cap-and-trade markets / D. Burtraw, K. Palmer, C. Munnings  et al., Resources for the Future, April 2013 (discussion paper ; 13-04)http://www.rff.org/RFF/Documents/RFF-DP-13-04.pdfAbstract (© RFF) :National and subnational economies have started implementing carbon pricing systems unilaterally, from the bottom up. Therefore, the potential linking of individual cap-and-trade programs to capture efficiency gains and other benefits is of keen interest. This paper introduces a two-tiered framework to guide policymakers, with an interest in North American policy outcomes. One tier discusses program elements that need to be aligned before trading of allowances across programs can occur. The second identifies benefits of incremental alignment of program elements even prior to trading between programs—which we call “linking by degrees.” We apply this framework to California’s cap-and-trade program and the Regional Greenhouse Gas Initiative. These programs are already linking through cooperation and sharing of information. Many aspects of the program designs are ready for the exchange of allowances within a common market; however, the difference in allowance prices remains an issue to be considered before formal linking could occur.--&#62; About this paper :Linking Carbon Markets Offers More Than Economic Benefits / Dallas Burtraw and Clayton Munnings,  Common Resources, 10/04/2013 http://common-resources.org/2013/linking-carbon-markets-offers-more-than-economic-benefits&#160;