In the early 2000s, London was choking on traffic, and people were desperate for a solution. Having exhausted the alternatives, Mayor Ken Livingstone proposed the only known cure, economics. Against “a massive and sustained media campaign,”36 he introduced a roughly fifteen-dollar fee for any driver who wanted to enter the congested heart of the city on weekdays, with the revenue to be used to support a progressive transportation agenda. Here’s what happened: Congestion dropped 30 percent in the toll zone, and typical journey times went down by 14 percent. Cycling among Londoners jumped 20
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