Professor Thomas Piketty has given a more detailed response to the Financial Times articles and blogs on his wealth inequality data in Capital in the 21st Century (here, here, here and here). He says it is “simply wrong” to suggest he made errors in his data.
There are a few things on which we agree. First, the source data on wealth inequality is poor. I have written that it is “sketchy” and Prof Piketty says it is “much less systematic than we have for income inequality”. Second, it would have been preferable for Prof Piketty to have used a more sophisticated averaging technique than a simple average of Britain, France and Sweden to derive an estimate for European wealth inequality. Third, the available data suggests a broad trend of reduction in wealth inequality during most of the 20th Century. Read more