British-based charity Oxfam has issued a rallying cry against inequality as it released its Even it Up report, which shows the number of billionaires had doubled worldwide since the economic crisis.
The charity said the report, endorsed by humanitarian Graca Machel, former UN chief Kofi Annan and Nobel economist Joseph Stiglitz, was the "opening salvo" of a new campaign to force world leaders to take action.
"Far from being a driver of economic growth, extreme inequality is a barrier to prosperity for most people on the planet," said Winnie Byanyima, Oxfam International's executive director on Wednesday.
"Today wealth is trickling upwards, and will continue to do so until governments act," she added.
"We should not allow narrow-minded economic doctrine and the self-interest of the rich and powerful blind us to these facts."
The report acknowledged that inequality between countries had fallen over the last 14 years, but claimed it was inequality within countries that mattered most, "as the poorest struggle to get by while their neighbours prosper".
According to the report, 70 per cent of people live in countries where the gap between poor and rich has widened over the last 30 years while inequality of individual wealth has become even more extreme.
It calculated that the wealth of the world's 85 richest people grew $US668 million ($A723 million) each day.
"If Bill Gates were to cash in all of his wealth, and spend $US1m every single day, it would take him 218 years to spend it all," it said.
"Since the financial crisis, the ranks of the world's billionaires has more than doubled, swelling to 1645 people."
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