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1. Different definitions
commemorative coin: commemorative coin is a kind of legal currency designed and manufactured by the state authorized the people's Bank of China to designate a national mint and issued by the state bank in a unified plan to commemorate international or domestic political, historical, cultural and other major events, outstanding figures, places of interest, rare animals and plants, sports events, etc
currency: currency CCY (currency) is the medium of purchasing goods and preserving wealth. It is actually the contract between the owner of the property and the market about the right of exchange, which is essentially the agreement between the owners
There are 113 commemorative coins issued by the people's Bank of China from October 1, 1984 to January 2019precious metal commemorative coins since 1979, when the first set of precious metal commemorative coins was issued to commemorate the 30th anniversary of the founding of the people's Republic of China, China's modern gold and silver commemorative coins have gone through nearly 40 years of brilliant development. More than 15 series and more than 2000 varieties of gold and silver commemorative coins have been sold Giant panda and rare animals, twelve zodiac animals, Chinese classical literature, ancient scientific and technological inventions and discoveries, Chinese traditional culture, Chinese famous painters, religious art, sports, military science and technology, etc., all of which reflect China's 5000 year history of civilization and long-standing Chinese culture
Currency: China has been using currency for 4000 years, and is one of the earliest countries in the world. The earliest currency: natural seashells. Metal currency: copper imitation shell and Qian Kai (cloth) (the middle and lower reaches of the Yellow River began to act as equivalents in the later period of the Yellow Emperor) 
3. Different categories
commemorative coins: they can be divided into precious metal commemorative coins and ordinary commemorative coins
precious metal commemorative coins include gold coins, silver coins, platinum coins, palladium coins and other precious metals or their alloys
Ordinary metal commemorative coins can be divided into ordinary coins and refined coins. The material of ordinary commemorative coin is the paper used for printing banknotes or the metal used for casting ordinary coins. The denomination indicates its legal value. It is mainly designed and forged on the theme of major events, festivals, anniversaries and rare animals at home and abroadcurrency: a coin is a small denomination. It's copper, aluminum or nickel
Paper money is a kind of legal tender. Legal currency is the currency that the government forces to circulate. The basic power of issuing banknotes is owned by the government and controlled by the central bank. The sum of notes and coins is called currency or cashdeposit currency, which refers to the demand deposit of commercial banks that can be withdrawn at any time, is also called demand deposit. As the current deposit can be converted into cash at any time, there is no difference between the bank's current deposit and currency. It is also a currency
savings deposits, time deposits and savings deposits are deposits that can be withdrawn after a certain period of time and can obtain interest. Although these deposits can not be used in the form of cheques, they can usually be converted into cash by notifying the bank in advance
In addition, the negotiable withdrawal order (now) and automatic transfer service (ATS) since the 1970s have narrowed the difference between time deposit and demand deposit. As a result of the narrowing of the difference, time deposits and savings deposits also become a kind of currency Near money refers to the assets that can perform the function of value storage and can be easily converted into the medium of exchange, but they are not the medium of exchange. For example, financial assets such as stocks and bonds are quasi currencies
money substitutes refer to things that can temporarily perform the function of medium of exchange, but cannot perform the function of value storage. For example, a credit card is a currency substitute< br />
currency
there are many popular definitions of currency, one of which is to equate currency with cash, and to define currency only as cash, which is too narrow for economic analysis. Because the deposit that can write a check can be used to pay for the goods and services purchased just like cash in circulation. If we define money as cash, it is difficult to relate money to all the purchases people make. In fact, it is precisely because of the connection between money and purchase that the issue of money attracts people's great interest. Therefore, in modern economics, it is necessary to include checking deposit and cash in the definition of currency
Another popular definition of money is to equate money with wealth. If we define money as wealth and mix money with stocks, bonds and real estate, then we can not define the basic characteristics of money in economic analysis. In fact, money, as a general equivalent, is the general representative of social wealth, but money is not equal to social wealth itself, it is only a part of social wealth. The third popular definition of money is to equate money with income. Income is the flow within a certain period, while money is the stock at a certain point. If money is defined as income, then the amount of money cannot be measuredcommemorative coin
commemorative coin is a legal tender issued by a country to commemorate major international or national political, historical and cultural events, outstanding figures, places of interest, rare animals and plants, sports events, etc., including ordinary commemorative coin and precious metal commemorative coin. The quality is generally refined and limited
All currencies issued by the people's Bank of China can be used for circulation, so precious metal commemorative coins can participate in circulation theoretically and have the function of circulation means. China commemorative coin is a legal tender with a specific theme, which is designed and manufactured by the National Mint designated by the people's Bank of China under the authorization of the state, and issued by the National Bank in a unified plan. Commemorative coins are usually issued to commemorate important political and historical events, traditional culture and other things of special significance in China. Ordinary commemorative coins have the same value as RMB of the same denomination circulating in the market, and can circulate in the market at the same time. The function of commemorative coins is mainly to commemorate a major festival or political, historical, cultural, outstanding people, places of interest, rare animals and plants and other things of legal currency. Collection is only an incidental function, and special theme and limited issue are the main characteristics of commemorative coinsCommemorative Banknote
Commemorative Banknote is specially issued to commemorate major events. Because of its commemorative significance and small circulation, it has great collection value and appreciation potential. Generally, it can be classified into two types: 1) pure commemorative banknotes, which are designed independently; ② The circulating banknotes were changed into banknotes and some special marks were added to distinguish them