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In a randomized audit study, we sent passengers in Boston, MA on nearly 1000 rides on controlled routes using the Uber and Lyft smartphone apps, recording key performance metrics. Passengers randomly selected between accounts that used African American-sounding and white-sounding names. We find that the probability an Uber driver accepts a ride, sees the name, and then cancels doubles when passengers used the account attached to the African American-sounding name. In contrast, Lyft drivers observe the name before accepting a ride and, as expected, we find no effect of name on cancellations. We do not, however, find that the increase in cancellations leads to measurably longer wait times for Uber.