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Elevators make the modern city possible. In New York City alone, commuters take an estimated four million elevator rides per day on tens of thousands of elevators. In China, two-thirds of a million of them are put into commission every year. Globally, the industry approaches $125 billion. But as cities continue to grow — and grow vertically — this crux to innovation may ultimately be the Achilles' heel of the city as we know it.
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