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答:走进商场,你会发现琳琅满目的商品几乎每一件都是明码标价的。比如,中号皮鞋:98元/双,一级花茶:23元/盒;等等。从表象上看,这种货币与商品的交换比例就叫商品的价格。在纸币和金属货币产生以前,市场上进行的是物物交易,如两把斧头换一张兽皮,这种物物交换比例也就是实物价格。随着生产的发展和交换的增多,容易分割、价值高、携带方便的金属就成为专门的交换媒介,这时的价格就用金属货币来表示了,如一把斧头等于一两银子。再后
A: Into the mall, you will find an array of goods almost every one is the price tag. For example, medium shoes: 98 yuan / double, a tea: 23 yuan / box; and so on. From the appearance point of view, this exchange rate of money and goods is called the price of goods. Prior to the creation of banknotes and metal currencies, there was an exchange of things on the market, such as the exchange of two axes for a piece of hide, which was the physical exchange rate. With the development of production and exchange increased, easy to divide, high value, easy to carry metal to become a special exchange medium, then the price is expressed in metal currency, such as an ax equal to one or two silver. Then later