G20 finance ministers gathering in Brazil Thursday are set to discuss the much-debated topic of taxing billionaires amid widening global inequality. According to a Oxfam study, the world’s top one percent saw their fortunes increase by $40 trillion over 10 years while taxation fell to “historically” low rates. While France, Spain, South Africa, Colombia and other countries support taxing the super-rich, the US and Germany are against the idea.