Pope Francis has called on the UN to do more to help the poor and encourage the "legitimate redistribution" of wealth.
"In the case of global political and economic organization, much more needs to be achieved, since an important part of humanity does not share in the benefits of progress and is in fact relegated to the status of second-class citizens," Francis told Ban Ki-Moon on Friday.
Francis, the first non-European pope in 1,300 years and the first-ever Latin American pontiff, has frequently called for economic changes and expressed his desire to bring the Catholic Church closer to the poor.
He also attacked the global economic system, which, as he put it last September, shouldn’t be based on "a god called money" anymore.
Francis is known as the "slum bishop" in his native Buenos Aires, as he often paid visits to shanty towns.