The key aspects of the revision are: the application of the weighting method used by the IMF, which takes into account so-called third-market effects; continuous updating of the countries incorporated into the index; and calculation of a chained index. The methodological changes in the calculation of the new index have only a slight effect on the development of the nominal index. However, the difference between the nominal and real index (CPI-based) has increased with the new calculation. This is explained by the fact that countries with a greater weighting in the new index have higher average rates of inflation than those whose weighting has been reduced.