This surprising lack of change is the result of something economists call the “rebound effect.” It’s a phenomenon familiar to urban planners, who long ago discovered that building more roads doesn’t ease traffic jams – it merely encourages more people to get in their cars and drive.
某些经济学家所谓的“反弹效应”造成了这种令人惊奇的结果。 这种现象城市规划师非常熟悉，他们早就发现铺设更多道路不能缓解交通堵塞——它只能鼓励更多的人开车。