Abstract
We estimate that a signi…cant fraction of commuters on the London underground do not travel their optimal route. Consequently, a tube strike (which forced many commuters to experiment with new routes) taught commuters about the existence of superior journeys -bringing about lasting changes in behavior. This eect is stronger for commuters who live in areas where the tube map is more distorted, thereby pointing towards the importance of informational imperfections. We argue that the information produced by the strike improved network-e¢ ciency. Search costs are unlikely to explain the suboptimal behavior. Instead, individuals seem to under-experiment in normal times, as a result of which constraints can be welfare- improving. JEL-classi…cation: D83, L91, R41
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