1, which must be real currency. As a medium of commodity exchange, money must be realistic rather than conceptual.

2. There is no need for a currency ontology with sufficient value, and currency symbols can be used instead. As a means of circulation, money is just a medium, which is fleeting, so it is enough to have the symbol of money alone.

3, including the possibility of crisis. Under the condition that money acts as a means of circulation, the exchange process is divided into two internal interrelated and external independent behaviors: buying and selling. These two processes are separated in time and space, and the function of currency circulation means "including the possibility of crisis"

Money is essentially a contract between owners about exchanging rights, and different forms of money are essentially unified. In the past, due to people's unclear understanding of the nature of money, money was mistakenly divided into different types from different angles, such as: according to the commodity value of money, it was divided into debt money and non-debt money; According to whether the exchange ratio of precious metals is agreed, it is divided into convertible currency and non-convertible currency.

Formally, money can be divided into physical money and formal money according to its commodity value. Physical currency itself is a special commodity, including value, such as sheep and precious metals. Formal currency itself has no value, its value is agreed by contract, only the contract value. The two forms are different, but they are essentially unified, that is, they are both agreed as exchange media and have contractual value.

Functions of currency execution:

The spot market price of a futures contract when the market value option expires. As a measure of value, money represents the value of all commodities as quantities with the same name, making them the same in quality and comparable in quantity. Money can perform this function because it is also a commodity and valuable. When the value of a commodity is expressed in money, the intrinsic value of the commodity is alienated into the external price.

Wealth storage means, the third function of money is to act as a wealth storage means, or a form of wealth holding. Note that besides money, there are many things that can be used as wealth storage means, such as bonds, stocks, real estate, gold and silver jewelry, works of art, durable consumer goods and so on. These investments may bring quite good returns to investors, while using money as a means of storage has basically no benefits.