The study estimating the extent of global private financial wealth held in offshore accounts - excluding non-financial assets such as real estate, gold, yachts and racehorses - puts the sum at between $21 and $32 trillion.
The research was carried out for pressure group Tax Justice Network, which campaigns against tax havens, by James Henry, former chief economist at consultants McKinsey & Co.
He used data from the World Bank, International Monetary Fund, United Nations and central banks .... http://www.huffingtonpost.com