《后汉书·列传·朱乐何列传》
又应通过交阝止、益州上计吏往来之便，买珍宝，收采其利，武帝时所谓均输的办法。 
又宜因交阯、益州上计吏往来，市珍宝，收采其利，武帝时所谓均输者也。 
We should also take advantage of the convenience of the officials of Giao Chi and Yi Province to buy treasures and collect their profits, which is the so-called method of equalizing transportation in the time of Emperor Wu.