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Within the framework of Marxian economics, exchange is linked with overproduction. Division of labor contributed to the enhancement of productivity and expansion of social surplus, and increased the necessity of exchange. The initial exchange is an occasional, scattered exchange of goods. However, exchange becomes an inevitable and frequent activity as the division of labor becomes professional and the over-production increases over time. Money, as the universal equivalent, emerges on the horizon to reduce trading cost. We can see from the above analysis that the rise in monetary demand is closely related to the expansion in trading scale and frequency which largely relies on the increase in over-production, that is the increase in disposable wealth.