In all the broad range of articles that, in a state of civilization, are needed by man, the only absolutely indispensable thing is money. For everything else there is some substitute--some alternative; for money there is none. Among articles of food, if beef rise in price, the demand for it will diminish, as a certain proportion of the people will resort to other forms of food. If, by reason of its continued scarcity, beef continue to rise, the demand will further diminish, until finally it may altogether cease and center on something else. So in the matter of clothing. If any one fabric become scarce, and consequently dear, the demand will diminish, and, if the price continue rising, it is only a question of time for the demand to cease and be transferred to some alternative. But this can not be the case with money. It can never be driven out of use. There is not, and there never can be, any substitute for it. It may become so scarce that one dollar at the end of a decade may buy ten times as much as at the beginning; that is to say, it may cost in labor or commodities ten times as much to get it, but at whatever cost, the people must have it. Without money the demands of civilization could not be supplied. Money was the most potent instrumentality in the evolution of society from a low to a high plane of civilization. It is valueless to man in isolation. It is indispensable to man in organized society. It is as necessary for the proprietary distribution of wealth as railroads and steamships are to its physical distribution. The aggregate force of the demand for money in any country depends upon the numbers of the population; with a stationary population the demand is steady, with an increasing population the demand increases, and in order to maintain undisturbed the equation of supply and demand the volume of money should be increased in at least a ratio corresponding to that of the increase of population. There are certain circumstances that to some extent disturb the relations between population and money supply, such as the broadening of the areas of population, and the multiplication of money centers. These circumstances might render necessary a larger percentage of increase in the money volume than would be indicated by the increase of the population. But under any circumstances the smallest money-increase that will suffice to maintain the equity of time contracts is an increase corresponding to the increase of numbers of the population. Under conditions of unvarying demand and unvarying supply the value of the unit of money would be unvarying. If as population and demand increase the supply of money be proportionately increased, there is no possibility of a change in the value of the unit of money.