People under 18-29 who make under $30k/year are much less likely to be traditionally "lower class" than other people in that income bracket. But sure, smartpho

People under 18-29 who make under $30k/year are much less likely to be traditionally "lower class" than other people in that income bracket. But sure, smartphones are pretty widespread these days. If that were the only factor biasing these busses towards the wealthier end of the society, then the bias wouldn't be very much. It's not the only factor.