See Average life of a banknoteThe time, on average, between the first issuance of a banknote and its withdrawal from circulation by the issuing central bank. High-value denominations usually have a longer average life than low-value ones which, due to their more frequent usage, deteriorate faster., Rate of returnRatio between the number of banknotes per denomination that return to a central bank, during a certain period, and the average number of banknotes in circulation during the same period. It is one of the indicators used in the management and analysis of cash in circulation..