货币是人类社会发展到一定的历史阶段的必然产物。货币产生之前,人们采取以物易物的方式进行交换,随着交换的发展,物物交换发生了困难,逐渐形成了利用某种物品作为交换的媒介。“贝”是我周最早的货币。商周时期,贝币流通的领域很广。不过,并没有脱离实物货币的范畴。随着社会经济的不断发展,逐渐出现了金属货币,初期的金属货币无一定形态,交易时要称重量。鉴定成色,方能使用,可称为金属称量货币。以后,由于商品交换日益扩大,为了方便交换,又把某种金属铸成一定成色和重量,这就是金属铸造货币。春秋、战国时期就已开始大量使用各种形态的青铜铸币。但当时我国处于分裂状态,各地经济发展并不平衡,都是自行铸币,所以货币种类繁多,主要的形制有铲形(布币)、刀形(刀币)、方形(爱金)、椭圆形(蚁鼻钱)、圆形(环钱)五种。秦始皇统一中国后,废除布、刀、贝等币,统一了全国的币制。规宅:黄金为上币,铜钱是下币,铜 Money is the inevitable product of the development of human society to a certain historical stage. Before the money was produced, people took the barter way to exchange. With the development of the exchange, the barter exchange had difficulty and gradually formed the medium of using some kind of goods as the exchange. “Shell” is my earliest currency. During the Shang and Zhou dynasties, there was a wide field of circulation of Pui coins. However, it has not deviated from the real money category. With the continuous development of social economy, the gradual emergence of the metal currency, the initial metal currency no certain form, weighing the weight of the transaction. Identification of fineness, can only be used, can be called the metal weighing currency. Later, due to the ever-expanding commodity exchange, in order to facilitate the exchange, again a certain metal casting a certain quality and weight, this is the metal casting currency. Spring and Autumn Period, Warring States period has begun extensive use of various forms of bronze mint. However, at the time, our country was in a state of split. The economic development in various parts of our country was not balanced. All of them were coin-making by themselves. Therefore, there are a wide range of currencies. The main forms are spade, knife, square, (Ants nose), round (ring money) five. After Qin Shihuang unified China, the abolition of cloth, knives, shells and other currencies, unified the national currency. House: gold is the previous currency, copper coins are the next currency, copper