Civilized countries generally adopt gold or silver or both as money. Instead of expressing the values of lead and tin, and wood, and corn and other things in terms of one another, we express them in terms of money in the first instance; and call the value of each thing thus expressed its price. If we know that a ton of lead will exchange for fifteen sovereigns at any place and time, while a ton of tin will exchange for ninety sovereigns, we say that their prices then and there are ?5 and ?0 respectively, and we know that the value of a ton of tin in terms of lead is six tons then and there. The price of every thing rises and falls from time to time and place to place; and with every such change 去书内

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    In the book Introduction to Political Economy published in 1803, the French economist Say also pointed out that political economics is a science of "explaining how wealth is produced, distributed and consumed". On this basis, he divided political economy into three parts: production, distribution and consumption, and established the dichotomy. In his Outline of Political Economy, James Mill inherited and developed Say's three-point method and put forward the object theory of four-point method, which reduced the research object of economics to the general principle of wealth production, distribution, exchange and consumption.

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