ROSABETH MOSS KANTER: By the 2020s, traffic congestion could be a whole lot worse, and only the affluent will be able to afford to live, work and be entertained in central urban districts where it’s possible to get around on foot or on e-bikes. In developing countries, and increasingly in U.S. cities, cars will move at bicycle rickshaw speed, thereby continuing to provide an occupation for street vendors who can sell you nearly anything while you’re stuck in traffic, including that night’s dinner.

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