A key difference between ridesharing services and standard yellow taxis was the rating system. After a trip using a ridesharing service, riders were encouraged to rate their drivers on a scale of one to five stars. The rating systems put immense pressure on drivers to maintain as high a rating as possible. Many drivers regarded the rating system as unfair, because they were sometimes penalized for factors out of their control. But just as passengers could rate drivers, drivers could also rate passengers. When low-rated passengers attempted to summon rides in the future, there was a greater likelihood of rejection by drivers. The rating systems used by ridesharing services seemed to be a key differentiator from taxicabs and for-hire services. But did the systems work as they should? Did the use of a ratings system lead to an improvement in service quality over competing services? Or were its flaws too serious and unfair to ensure anything other than additional stress for drivers?