《明史·列传·卷四十八》
皇上因他们所贡的马匹都不堪用，如果增价则正中敌人之计，便压下了罗通的建议。
帝以所贡马率不堪用，若增价正堕贼计，寝通奏。
The emperor suppressed Luo Tong's suggestion because the horses they offered were not good enough. If they increased the price, it would be right on their enemies' plan.