The gap between the super-rich and the poorest half of the global population is starker than previously thought.
Currently just eight men, including Bill Gates and Michael Bloomberg, have as much wealth as 3.6 billion people combined.
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Last year's report said the richest 62 people on the planet in 2015 owned as much wealth as the bottom half of the population.
Oxfam outlined measures that it hopes will be enacted to help reduced the inequality.
They include higher taxes on both wealth and income to ensure a more level playing field and fund investments in public services, and greater international cooperation by governments on ensuring workers are paid decently and the rich don't dodge paying taxes.
If not, it warns, public anger against this kind of inequality will continue to grow and lead to more seismic political changes.
The full list includes: Bill Gates, Amancio Ortega, Warren Buffett, Carlos Slim, Jeff Bezos, Mark Zuckerberg, Larry Ellison and Michael Bloomberg.