The world's richest one percent increased their fortunes by a total of $42 trillion over the past decade, according to Oxfam.

Taxes on the rich have decreased to historic lows, according to Oxfam.

Brazil has prioritized international cooperation on taxing the super-rich during its G20 presidency.

The G20 summit in Rio de Janeiro will discuss methodologies to tax billionaires and high-income earners.

Oxfam reported that the $42 trillion increase in wealth for the richest one percent is nearly 36 times more than the wealth accumulated by the poorer half of the world's population.