《管子·国蓄》
商品遇上落价，就按照工价的一半也卖不出去，人民生产不够本钱。商品遇上涨价，就是出十倍高价也买不到手，人民需要不得满足。
物适贱，则半力而无予，民事不偿其本；物适贵，则什倍而不可得，民失其用。
When the price of goods falls, they cannot be sold even for half of the cost of production, and people cannot make a profit. When the price of goods rises, people cannot buy them even at ten times the price, and their needs cannot be met.