《管子·轻重戊》
管仲还对楚国商人说： 您给我贩来生鹿二十头，就给您黄金百斤；加十倍，则给您黄金千斤。 
管子告楚之贾人曰： 子为我致生鹿二十，赐子金百斤。什至而金干斤也。 
Guan Zhong added that whoever gets me 20 live deers will get 100 catties of gold. For every additional 10 deers, he will get 1,000 catties of gold.