With wealthy individuals like Facebook's Eduardo Saverin (and multinational corporations) able to up sticks and go to a lower tax jurisdiction, countries like USA are getting worried about the erosion of their tax base. There is already legislation proposed in the USA to still be able to tax Saverin. Should they be able to tax a former citizen regardless of where he is? This will require some coordination between various tax jurisdictions almost like having a uniform global tax regime ultimately with some sort of tax sharing arrangement between countries - is this where we are heading? Many countries have been getting very aggressive over the last decade or so about taxing their citizens and getting more information on their tax payers. Countries can entice wealthy individuals and corporations who want to go tax shopping for the best deal leaving many countries with high tax rates struggling to fill their coffers.