It was sought in journeys only for its utility, and in that trade the transactions first became impersonal. In the selection of leading wares individuals could not experiment for their own risk. By taking what each wanted at a time selection at last resulted, and when we are told that a certain group uses this or that group of articles for money, we are told only what articles predominate in their desires or transactions; in other words, what stage in the selection of a money they have reached. It is evident that this entire operation was an impersonal and unregulated play of custom, which went through a long and varying evolution, but kept its authority all the time and at every stage. The persistence of the word "shilling" in our language is a striking proof of the power of custom--above all, popular custom--in connection with money. The metric system was invented to be a rational system, but the populace has insisted on dividing kilograms and liters into halves and quarters. Language, money, and weights and measures are things which show the power of popular custom more than any others. The selection of predominant wares reached its acme in the selection of _one_, not necessarily the commodity most desired, but, after the function of money is perceived, the one which performs it best. To return and take up a greater number is to go backward on the path of civilization. +155. The ethical functions of money.+ From shells to gold the ethics of social relations has clung to money. There is more pure plutocracy in Melanesia than in New York. The differentiation of men by wealth is greatly aided by money, because money adds immensely to the mobility of wealth and lets all forces reach their full effect in transactions. The social effect of debt is best seen in barbarous societies which have money. Debt and war together made slavery.[363] It is, however, an entire mistake to regard a money-system as in itself a mischief-working system. The effect of money is exhausted when we notice that it makes wealth mobile and lets forces work out their full result by removing friction. So soon as there is a money there is a chance for exchanges of money for goods and goods for money, also for the loan and repayment of money at different times, under which transactions interests may change and speculation can arise. These facts have always interested the ethical philosophers. "Naught hath grown current amongst mankind so mischievous as money. This brings cities to their fall. This drives men homeless, and moves honest minds to base contrivings. This hath taught mankind the use of villainies, and how to give an impious turn to every kind of act."[364] In such diatribes "money" stands for wealth in general. Money, properly speaking, has no more character than axes of stone, bronze, iron, or steel. It only does its own work impersonally and mechanically. The ethical functions and character ascribed to it are entirely false.