The recommendation of the 1993 SNA is that either the EKS or G-K methods be used in international comparisons of purchasing power. These aggregations may be done by regions using any numeraire currency they wish, since these estimates are independent of what happens at the world level. However, it was also recommended that research be undertaken during the 2005 round on alternative approaches that might be used in the current benchmark comparisons. At least 5 such approaches were mentioned by an expert group. These included the minimum spanning tree approach (Robert Hill) as applied to countries within country groups, a modified Ikle approach (Yuri Dikhanov), the share and additive methods (Erwin Diewert and Sergey Sergueev), and the modified CPD approach (Prasada Rao). These issues might be treated in a background paper that surveyed some of the proposed methods followed by or with a separate paper that would examine applications using preliminary data sets from the 2005 surveys and eventually the 2005 benchmark data.
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