The play of custom and convention is well shown by the use of the Macedonian coins in England. The coins of Philip bore on the obverse a head with a wreath, and on the reverse a chariot driver drawn by two horses. In Britain this coin became a sign of value and lost its reference to the sovereign. It is possible to show the order of the reigns of the kings by the successive omissions of parts of the figures, until only the wreath was left and four perpendicular strokes and two circles for the legs of one horse and two chariot wheels. Each change was a mark of value and then it was further changed to save trouble.[283] On the Palau Islands there were seven grades of money, determined by the size. Only three or four pieces exist of the first grade. The second grade is of jasper. The third consists of agate cylinders. These three grades are used only by nobles. They have the same rank as gems amongst us. The people think of the money as coming from an island where it lives a divine life, the lower ranks serving the upper. They have myths of the coming of the money to Palau.[284] These examples show to what a great extent other ideas than those of value come into play in money. +143. Intergroup and intragroup money.+ When money is used to overcome the difficulties of barter two cases are to be distinguished,--the intergroup and the intragroup uses, which are primarily distinguished by a space relation. The intragroup use is here, in the we-group, close at hand. The intergroup use is between our group and some out-group. It will be found that all money problems include these two cases. "At least we shall find that the current commonplace of the economists about the succession of natural economy, money economy, and credit economy, is not even remotely apt to the real problems."[285] What is true is that, on a money economy, it is found that there is, or may be, a constant exchange of money for goods and goods for money, from which gain or loss may result; and furthermore that the risk (aleatory element) in this exchange is intensified, if time is allowed to intervene. Inside the we-group the first need for money is for fees, fines, amercements, and bride price. In Melanesia pigs are not called money and there is shell, feather, and mat money, but pigs are paid for fines, penalties, contributions to feasts, fees in the secret society, pay for wives, and in other societal relations. What is needed is a mobile form of wealth, with which social dues can be paid. This is the function of money which the paper-money projectors have in mind when they propose to issue paper which the state shall take for taxes. It is evident that it is to be distinguished from the economic function of money as a circulating medium. The intragroup money needs to be especially a measure and store of value, while the intergroup money needs to be a medium of exchange. In the former case barter is easy; in the latter case it is regular. In