All writers upon political economy agree that money is the universal standard of value, and the measure of exchange, foreign and domestic, and that the power to coin and regulate the value of money is an essential attribute of national sovereignty. Goods and chattels were directly bartered, one for another, when the division of labor was first introduced, but gold and silver were adopted to serve the purpose of exchange by the tacit concurrence of all nations at a very early period in the history of commercial transactions. Commodities of various kinds were used as money at different periods in different countries, but experience soon showed the commercial nations that gold and silver embodied the qualities desirable in money in a much greater degree than any other known commodity or substance. Daily experience shows the truth of that proposition, and supersedes the necessity of any remarks to enforce it, as all admit that a commodity to serve as a standard of value and a medium of exchange must be easily divisible into small portions; that it must admit of being kept for an indefinite period without deteriorating; that it must possess great value in small bulk, and be capable of being easily transported from place to place; that a given denomination in money should always be equal in weight and quality, or fineness, to other pieces of money of the same denomination, and that its value should be the same or as little subject to variation as possible. Such qualities, all agree, are united in a much greater degree in gold and silver than in any other known commodity, which was as well known to the members of the convention who framed the constitution as to any body of men since assembled, and intrusted to any extent with the public affairs. They not only knew that the money of the commercial world was gold and silver, but they also knew, from bitter experience, that paper promises, whether issued by the states or the United States, were utterly worthless as a standard of value for any practical purpose.