《管子·轻重乙》
所以要削减商人赢利而帮助农民生产，就请把每釜粮食的价格提高三百钱。
故杀正商贾之利而益农夫之事，则请重粟之价金三百。
Therefore, if you want to reduce the profits of merchants and help farmers produce, please increase the price of grain by three hundred coins per bushel.