The kind of control that platforms of this sort maintain over service providers shapes providers’ incentives, and these effects must be taken into account in designing the platform. For instance, if tomorrow Uber allowed drivers to set their own fares, competition among drivers would likely lower fares in the short run. This would make riders happier, as long as they could get rides. But lower fares would make driving less attractive, drivers would likely leave Uber, and a system with lower fares but fewer cars might well be less attractive to riders