The poor may not always be with us. The world is about a hundred times wealthier today than it was two centuries ago, and the prosperity is becoming more evenly distributed across the world’s countries and people. The proportion of humanity living in extreme poverty has fallen from almost 90 percent to less than 10 percent, and within the lifetimes of most of the readers of this book it could approach zero. Catastrophic famine, never far away in most of human history, has vanished from most of the world, and undernourishment and stunting are in steady decline. A century ago, richer countries
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