Harriet Martineau,
Illustrations of political economy…
(1834)
“ Nothing can be used as a standard which has not properties in common with the thing to be estimated. That which has length can alone measure length; and that which has value can alone measure value.”“How then can an ideal standard of value be used at all?”“Because an ideal value alone is referred to it. But that abstract value is obtained through the reality which is ascertained by the comparison of commodities. ”
