"The tax on the super-rich is something that deserves study and consideration, to which we are open," Paulo Rangel told journalists, at the exit of the G20 Task Force Meeting for the Establishment of a Global Alliance against Hunger and Poverty, promoted in Rio de Janeiro by the Brazilian President, Luiz Inácio Lula da Silva.

The Portuguese minister highlighted, "Its contours have not been fully defined".

In the opinion of the head of the diplomacy of Portugal, a country that was invited by Brazil to be an observer member of the G20 this year, it is necessary first to "agree on the terms under which a contribution of this type can be established and what is its universe of application".

"Because we are talking about a rate at a global level, so how can this be operationalised", he highlighted, which is the reason why the Portuguese Government does not have "a closed position on the subject".

Brazil, which holds the presidency of the group of the 20 largest economies in the world (G-20) until the end of November, commissioned the report and hopes that it will be supported by the maximum number of countries, during the summit of finance ministers and presidents of the group's Central Banks, which takes place between today and Friday in the Brazilian city of Rio de Janeiro.

The report's conclusions indicate that a minimum tax of 2% on billionaires would be the most appropriate option to restore tax progressivity globally and raise more than 250 billion dollars (230.9 billion euros at current exchange rates) per year.

According to the European Union Tax Observatory, there are less than 3,000 billionaires worldwide.