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In order to exploit this line of inquiry, reasearhcers around the world undertook the construction of the World Top Incomes Database (WTID), a pioneering major effort that aims to faciclitate the study and comparision of income and wealth distribution's evolution for as many countries and as many years as possible, with emphasis in tax records data. It started with a study of top incomes in France, by Piketty (cita). which gave way to a series of similar studies for other countries. The WTID contains periodically updated data on over 20 countries, allowing researchers to add new observations, either on new volumes of tables or as additions to already existent volumes. There are 22 countries included in the fisrt two volumnes of the WTID , but a total of 42 countries will appear in the next volume, to be publish soon and ready to be used to further promote work in this area.