1, barter
In the absence of money, people are relying on barter to obtain different goods, conversion between different goods thanks to an agreement between the two, however, as more and more people, more and more complicated exchange of goods , making it difficult to exchange successful. For example: When A wants to exchange for rice sickle B, but B is required for lamb, so in order to get A sickle and others are looking to change mutton, lamb but they just need some rice, it is difficult to succeed.
2, the birth of money
This time, you need to have a can serve as something general equivalent to the exchange of goods, generally equivalent must be a trait fixed, easy to hold and carry, and everyone can accept things, and, we can accept what is certainly those precious things, such as gold, silver, copper and the like.
However, over time, it was discovered that the metal fineness currency transactions brought everyone is different, this time it got one of the most highly respected, people are convinced the leader to coins and printed on a logo to use, so that each appeared counterfeit money, do not worry, of course, everyone should labor to the point of intersection leader.
3, the birth of banknotes
As people continue to expand out, need to buy big-ticket goods, when this time we need a lot of money to transfer, in which the long-distance transmission to spend a lot of manpower and resources, and that will inevitably arise in which this transfer process criminals to attack, in addition to metal currency in circulation will be worn for a long time, the accumulation of problems this time the bill was born.
Let the paper has value, there is need for national authorities to give proof of the value of these papers have, in order to facilitate exchange between people, this time the bank (banks) correspondingly born, however, the issue of paper money is a daunting challenge , issued more will cause inflation, devaluation of goods, issued less will lead to the economic downturn, and that the country should also check a large number of old banknotes, destruction, issue new notes, various accounts have to deal with clear, do good record, with the development of technology, the birth of the Internet, the emergence of the computer, this bill is relatively simple statistical number.
4, virtual currency
Network development, has become more frequent among people by bank transfer, in particular, the rise of e-commerce, virtual currency gradually move towards the stage of history.
With the support of mobile payments, we found that really can not do without those numbers, and this time we have to worry about, and if those numbers I, without my consent under fewer, especially network hackers, viruses, or is due to force majeure factors, those we pay to save the database information, damaged, greedy to go, how to do, after all, we are to be exchanged through intermediaries.
5, block chain technology,
The nature of the payment: the account A reduction in the amount increased to account B, and return the original to barter like before, but we are the general exchange of equivalents. I have always felt, continuous development of society will eventually return to the original, the beginning, each of us is not a rule-bound individuals, however, due to the complexity of the environment, awareness is not enough, this time we need a leader to led us to a better life, as we continue to develop, they want to go more places, in search of better resources at any time increase in the number of different environments of life, social awareness are not the same, This requires the system to regulate us,
Block Chain (English: blockchain or block chain) are connected in series by series written records of cryptography and content protection (also known as blocks). Each block comprises a cryptographic hash of the previous block, a corresponding timestamp and transaction data (typically using Merkel tree (Merkle tree) hash algorithm shown), such that the contents of the block has a difficult design characteristics of tampering. Block chain technology using the concatenated distributed the books to make effective two-party transaction records, and permanently examine this transaction.
Application of the maximum current block chain technology is digital money, for example: currency bits invention.