《管子·地数》
所有这些，是人们分别土地种植粮食的条件，也是兵器和钱币的最初来源。
此之所以分壤树谷也，戈矛之所发，刀币之所起也。
All of these are the conditions in which people cultivate food separately on the land, and are also the original source of weapons and currency.