Growing global inequality has become the defining moral and economic challenge of our age. At a time when technological advancement is rewriting the boundaries of human possibility, the gap between the billionaire class and the world's poorest is widening at a pace that should alarm every responsible policymaker. Oxfam's latest findings — that billionaires in leading economies added an astonishing $2.2 trillion to their wealth in a single year, an amount sufficient to lift every........

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