铁冶、煮盐和铸钱是封建国家的三大利源.我国从春秋战国以来一直保持着官营性质.《管子》提出的“官山海”就是指封建国家控制山林川泽的资源,其中重要的为矿产和盐业资源.盐在我国的封建时期一直是官营的.矿业虽然长期的支配原则是矿山的国有,不准私人任意开采,但也有短时期的、或局部地区的、或对某些矿种的放宽政策,可由私人经营. Iron smelting, salt cooking and casting money are the three major sources of feudalism. China has maintained its official nature since the Spring and Autumn and the Warring States period. Guanshanhai proposed by Guanzi refers to the resources of the feudal state to control the mountains and rivers and the importance of the resources. The resources for minerals and salt industry. Salt has always been government-run during the feudal period of our country. Although the principle of long-term mining is the state-owned mining, is not allowed private mining, but there are short-term, or local, or The relaxation policy for certain minerals can be operated privately.