Commodity money cans or foil pouches of mackerel fish fillets, which have a fairly standard cost and are easy to store. These may be exchanged for many services in prisons where personal possession of currency is prohibited. In situations where the commodity is metal, typically gold or silver, a government mint will often coin money by placing a mark on the metal that serves as a guarantee of the weight and purity of the metal. In doing so, the government will often impose a fee which is known as seigniorage. The role of a mint and of coin differs between commodity money
Purity test "the form of twenty very personal questions, designed to determine the state of their morals and their 'purity ratio'. For example, so many marks are lost for smoking, drinking, and every time the sinner kisses a girl or boy. Then, after truthfully answering all the questions, the total number of bad marks are added up and subtracted from a hundred. What is left, if any, is the 'purity ratio'. The test is unofficial and just what it will prove when completed nobody knows." Alan Dundes, a professor of anthropology and folklore at the University of California, Berkeley, and Carl R.