This is about the wealthy contributing more ... the extremely wealthy contributing more and being proud to do that. "This is about the wealthy contributing more to the society, the extremely wealthy contributing more and being proud to do that," Phil White, retired business owner and Patriotic Millionaires co-signatory, told CNBC. But experts are divided over the effectiveness of a wealth tax, and its how achievable it is in reality. Data suggests that wealth tax accounts for only a very small proportion of total tax revenues in the countries where it has been applied. Data suggests that a wealth tax accounts for only a very small proportion of total tax revenues in the countries where it has been applied.

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Persons: Joe Biden, Biden, Phil White, Abigail Disney, Brian Cox, Arun Advani, Advani, Christine Cairns, PwC, Tord Kolstad, Kolstad, Kolstad Eiendom Organizations: Patriotic, Patriotic Millionaires, CNBC, Scottish, University of Warwick Locations: Brazil, Europe, Switzerland, Norway, Spain, Colombia