《资治通鉴·陈纪·陈纪三》
永定年间，我朝刚建立不久，白银难得，授予官职的文书却容易求取，暂时用官阶代替赏赐的钱币绢帛。
永安之时，圣朝草创，白银难得，黄札易营，权以官阶，代于钱绢。
During the Yongding era, our dynasty was just established and silver was rare, but it was easy to obtain the documents for granting official positions. The official ranks were used as rewards to replace money and silk temporarily.