I've included that! That's why I'm using PPP conversion factor for private consumption provided by world bank http://data.worldbank.org/indicator/PA.NUS.PRVT.PP

I've included that! That's why I'm using PPP conversion factor for private consumption provided by world bank http://data.worldbank.org/indicator/PA.NUS.PRVT.PP/countries?display=default http://data.worldbank.org/indicator/PA.NUS.PRVT.PP/countries... I've also considered direct taxes for this comparison