5. Divisibility; that is, the quality in the monetary material that permits it to be divided easily into smaller amounts and then to be united again into larger masses at little cost and without loss in amount or in quality. This quality is present only when the material is quite homogeneous throughout the whole mass, a condition fulfilled more completely by the metals than by any other goods. This quality makes it possible to put the governmental stamp upon the money material, and to produce pieces, some of which are exact duplicates and some exact multiples, of others. In this manner pieces of money are provided suitable for transactions of different magnitudes, down to small fractional amounts. A monetary system of this kind aids greatly the development of the sense and habit of exact estimation of price. § 3. #Industrial changes and the forms of money#. The money use, as has just been shown, is a resultant of a number of different motives in men. The changing material and industrial conditions of society change the kind of money that is used. Things that have the highest claim to fitness for money with a people at one stage of development have a low claim at another. The final choice of the money-good depends on the resultant of all the advantages. Shells are used for ornament in poor communities but cease to be so used in a higher state of advancement, and thus their saleability ceases. Furs cease to be generally marketable in northern climes, when the fur-bearing animals are nearly killed off and the fur trade declines. When tobacco was the great staple of export from Virginia, everybody was willing to take it, and its market price was known by all. It served well then as the chief money, but, as it ceased to be the almost exclusive product of the province, it lost the knowableness and marketability it had before. In agricultural and pastoral communities where every one had a share in the pasture, cattle were a fairly convenient form of money, but in the city trade of to-day their use as money is impossible. Thus, in a sense, different commodities compete, each trying to prove its fitness to be a medium of trade; but only one, or two, or three at the most, can at one time hold such a place. While industrial changes and conditions affect the choice of money, in turn money reacts upon the other industrial conditions. If a new and more convenient material is found or the value of the money metal changes to a degree that affects the generalness of its use, industry is greatly affected. The discovery of mines in America brought into Europe in the sixteenth century a great supply of the precious metals, and this change in the use of money reacted powerfully upon industry. Money, being itself one of the most important of the industrial conditions, is affected by and in turn affects all others.