This would make for a very interesting academic study, to figure out whether variation in tip size is driven more by personality dimensions (agreeability, gener

This would make for a very interesting academic study, to figure out whether variation in tip size is driven more by personality dimensions (agreeability, generosity, etc) or by socioeconomic status. Presumably it's a combination of both, where on a diverse platform like Uber it weighs more heavily towards socioeconomic drivers and in a more homogeneous environment like an expensive restaurant it comes down more to personality traits.