【中文版】

为什么金属货币会自动退市？

金属货币是指以金属为材料制成的货币。在历史上，金属货币被广泛使用，如黄金、白银、铜等。然而，随着时代的发展，金属货币逐渐退出了市场，这究竟是为什么呢？

首先，金属货币的流通性较差。与纸币相比，金属货币的携带和运输都更为不便，这限制了其在市场上的流通。其次，金属货币的制造成本较高。开采和加工金属需要大量的人力和物力成本，这使得金属货币的价格较高。此外，金属货币的耐用性也较差。纸币可以印刷成千上万次，而金属货币在使用过程中容易磨损和变形。

最后，现代社会对货币的需求已经发生了变化。随着科技的发展，电子支付和数字货币逐渐取代了传统货币。这些新型货币具有更高的便利性和安全性，可以随时随地使用，无需担心磨损或遗失。此外，数字货币还可以根据市场需求进行无限量的发行，这使得货币的供应更加灵活。

综上所述，金属货币由于其流通性差、制造成本高、耐用性差以及无法满足现代社会的需求等原因而逐渐退出了市场。如今，人们更倾向于使用新型的电子支付和数字货币，它们具有更高的便利性和安全性，更适应现代社会的发展需要。

【英文版】

Why do metal currencies automatically go off the market?

Metal currencies refer to coins made of metal materials. In history, metal currencies were widely used, such as gold, silver, copper, etc. However, with the development of the times, metal currencies gradually withdrew from the market. What is the reason for this?

Firstly, metal currencies have poor circulation. Compared with paper currency, metal currency is more difficult to carry and transport, which limits its circulation in the market. Secondly, the manufacturing cost of metal currency is high. Mining and processing metals require a lot of manpower and material costs, which makes the price of metal currency high. In addition, metal currency is also less durable. Paper currency can be printed thousands of times, while metal currency is easy to wear and deform during use.

Finally, the demand for currency in modern society has changed. With the development of technology, electronic payment and digital currency have gradually replaced traditional currency. These new currencies have higher convenience and security, can be used anytime and anywhere without worrying about wear and tear or loss. In addition, digital currency can also be issued indefinitely according to market demand, which makes the supply of currency more flexible.

In summary, metal currencies have gradually withdrawn from the market due to their poor circulation, high manufacturing costs, poor durability, and inability to meet the needs of modern society. Nowadays, people prefer to use new electronic payment and digital currencies, which have higher convenience and security and are more suitable for the development needs of modern society.