the value of the circulating medium are mischievous: they disturb existing contracts and expectations, and the liability to such changes renders every pecuniary engagement of long date entirely precarious." In 1887 William Stanley Jevons referred to previous authors and discussed an indexed unit of account which he calls a "tabular standard of value". In 1887 Alfred Marshall, also referring to previous authors, discussed a similar proposal. In 1998 and onwards, Robert Shiller similarly argued for the introduction of an indexed unit of account into the United States economy as a means of eliminating inflation risk. See also Constant Item Purchasing Power Accounting WCU – World Currency Unit Mexican Unidad de Inversion Unidad de Fomento Unidad de Valor Constante Unidade Real de Valor Notes Inflation