Mexico's Culture Minister Alejandra Frausto sent letters to the companies which request a "public explanation on what basis it could privatise collective property."
Oxfam in its latest report says four out of every five dollars of wealth generated in 2017 ended up in the pockets of the richest one percent, and half of the poorest people in the world did not get anything.
An Oxfam report published to coincide with the week-long World Economic Forum in Davos, Switzerland, says the world's eight richest people, all men, are as wealthy as the planet's 3.6 billion poorest people.
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