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Andres I like (and agree with) your point that what you measure depends on what question you want answered. Single country longitudinal studies may well want to develop a composite measure of flows (income) and stocks (capital) to identify the middle class, although doing this rigorously presents interesting conceptual challenges. I guess my original blog entry focused on attempting to get comparable measures of the middle class across countries for two reasons: first, to place alongside other economic indicators to compare where countries were along their development paths; and (b) to aggregate the numbers of the middle class across groups of countries to see how they may stack up across countries in other regions or at other income levels. As you point out, getting comparable data across countries is challenging at best (and a fool's quest at worst!), so a simpler measurement is warranted for such purposes. Trying to include capital stock measurements in cross country analysis opens up a can of worms. A long time ago (1994 to be precise), I worked on a research project to develop a comparable measure of human capital across countries (its a 1995 JDE article) and I know the shortcomings of these methodologies and how hard such measures are to compute. Best regards Vikram