| Ever since barter trade appears in humen sociesty, currency began to play an important role during the porcedure. As economy and technology of our society develops, currency have also undergone different developing phases, from initial subtantial currency acting as exchange media to subsidary currency, such as coins and bank notes. Breakdown of the Bretton Woods System in 1970's led to the United States' suspension of convertibility from dollars to gold, and currency gradually converted from value substance to a completely abstract value symbol. Then at the end of 20th century, the acceleration of science and technology development and the progression of economic unitization also promoted the acceleration of the change of the currency form. And now, the human society is undergoing a critical transition from paper currency to electronic currency.The present thesis consists of altogether 5 parts. Part 1begins its discussion from the inevitable law of currency development and clarifies that the emergence of currency is inevitable in the process of economic development and the evolution of commodity value form. Through the recognition of the forms of present virtual currency, discussions are made on the definition of present virtual currency and two conclusions (one is in broad sense and another narrow sense) are drawn at the end. Part 2 treats the two properties of non-bank-issued virtual currency--current ability and information product. Part 3 mainly deals with the application of non-bank-issued virtual currency in profitable activities. It has greatly affected e-commerce and meanwhile promoted the emergence of a new form of e-commerce based on virtual currency trade. As a result, hot online games are also paid more attention to. The virtual currency, named Linden Dollar , in the latest online game Second Life, which based on 3D platform and web2.0 core,has even been regarded as substantial fortune. Part 4 treats the virtual currency created for online virtule community. Such new subsidary currency will bring virtual communities more vitality and virtual communities will become the hothouse for carrying out subsidary currency experiments. The last part raises some propects and suggestions to non-bank-issued virtual currency. |