《汉书·志·食货志下》
用尽了巴、蜀的租赋却不足以抵偿所花的费用，就征求豪民到南夷种田，把粟交给地方政府，从都内接受粟钱。
悉巴、蜀租赋不足以更之，乃募豪民田南夷，入粟县官，而内受钱于都内。
The revenues of Ba and Shu were exhausted, and still were not sufficient to cover the expenses. So the wealthy people were asked to send people to the southern barbarians to cultivate the land and supply the local administration with grain in exchange for money from the capital.