THIRDLY, as money is the medium of commerce, it is the king's prerogative, as the arbiter of domestic commerce, to give it authority or make it current. Money is an universal medium, or common standard, by comparison with which the value of all merchandize may be ascertained: or it is a sign, which represents the respective values of all commodities. Metals are well calculated for this sign, because they are durable and are capable of many subdivisions: and a precious metal is still better calculated for this purpose, because it is the most portable. A metal is also the most proper for a common measure, because it can easily be reduced to the same standard in all nations: and every particular nation fixes on it it's own impression, that the weight and standard (wherein consists the intrinsic value) may both be known by inspection only. AS the quantity of precious metals increases, that is, the more of them there is extracted from the mine, this universal medium or common sign will sink in value, and grow less precious. Above a thousand millions of bullion are calculated to have been imported into Europe from America within less than three centuries; and the quantity is daily increasing. The consequence is, that more money must be given now for the same commodity than was given an hundred years ago. And, if any accident was to diminish the quantity of gold and silver, their value would proportionably rise. A horse, that was formerly worth ten pounds, is now perhaps worth twenty; and, by any failure of current specie, the price may be reduced to what it was. Yet is the horse in reality neither dearer nor cheaper at one time than another: for, if the metal which constitutes the coin was formerly twice as scarce as at present, the commodity was then as dear at half the price, as now it is at the whole. THE coining of money is in all states the act of the sovereign power; for the reason just mentioned, that it's value may be known on inspection. And with respect to coinage in general, there are three things to be considered therein; the materials, the impression, and the denomination. WITH regard to the materials, sir Edward Coke lays it down[a], that the money of England must either be of gold or silver; and none other was ever issued by the royal authority till 1672, when copper farthings and half-pence were coined by king Charles the second, and ordered by proclamation to be current in all payments, under the value of six-pence, and not otherwise. But this copper coin is not upon the same footing with the other in many respects, particularly with regard to the offence of counterfeiting it. [Footnote a: 2 Inst. 577.]