ON NOVEMBER 8th 2016, Narendra Modi, India's prime minister, stunned its 1.3bn people by announcing that most banknotes would soon become worthless. Indians then queued for weeks on end to exchange or deposit their banned money at banks. The comfort for the poor was that the greedy, tax-dodging rich would suffer more, as they struggled to launder their suitcases full of cash by year-end.
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