Second-hand dealers refer to people who illegally buy RMB and foreign currency issued by the state and resell them to national banks or foreign trade departments to obtain foreign exchange.

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"Second-hand dealer" refers to a person who specializes in reselling and reselling in the commercial field to earn the difference. They usually do not directly participate in the production of products or provide services, but gain profits by obtaining information and resources from various markets, trading and changing hands.

The emergence of second-hand dealers can be traced back to the early commodity exchange and commercial activities. In the process of commodity circulation and exchange, some people find business opportunities and start to buy products from manufacturers or suppliers, and then sell them to consumers to get the difference. This method has gradually developed into a specialized industry and formed a corresponding market and commercial network.

Second-hand dealers play an important role in the commercial field. Their existence can promote the circulation of goods and the activity of the market, and at the same time provide more sales channels and customer groups for producers or suppliers. However, due to the lack of transparency and supervision, there are certain market risks and fraud.

There are many types of second-hand dealers, and different industries and fields will have different specific forms. Here are some common types of "second-hand dealers":

Commodity reselling is the most common form of "second-hand dealer", which refers to buying products from low-priced channels and then reselling them at high prices. For example, cheap goods are imported from abroad and sold at high prices in China.

This kind of "second-hand dealers" mainly buy assets at low prices through investment markets such as stocks and real estate, and then sell them after the price rises to earn the difference.

This kind of "second-hand dealers" mainly resell resources by obtaining various resources, such as raw materials and energy. For example, cheap oil or iron ore is imported from abroad and sold at high prices in China.

Service reselling is a kind of "second-hand dealer", which deals mainly by providing various services, such as intermediary services and labor dispatch. For example, provide recruitment services for employers and charge them recruitment fees.

Second-hand dealers are a kind of business phenomenon, which makes profits by changing hands to buy and sell. Although there are certain market risks and frauds, it promotes the circulation of commodities and the development of the market to a certain extent.