《天工开物·中篇·舟车》
有钱、有地位的人要出门到外地的时候，往往怕走远路；有些物品虽然价钱低贱，却也是生活所必需，因为缺乏也就需要有人贩运。
人有贵而必出，行畏周行；物有贱而必须，坐穷负贩。
When rich and honourable people travel to other places, they often fear long journeys; although some items are inexpensive, they are also essential for life, so people are needed to transport them due to their unavailability.