The kinds of money
Personal possession of currency is prohibited in U.S. prisons, although, in practice, prisoners still exchange goods and services. Until 2003, the year in which the U.S. government banned smoking in federal penitentiaries, cigarettes were the preferred medium of exchange among prisoners. One important difference between using cigarettes and using dollars as money is that______ have intrinsic value.
U.S. dollars are example of_____ money.