Front Page Titles (by Subject) Measurement of Credit. - Money and the Mechanism of Exchange
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Measurement of Credit. - William Stanley Jevons, Money and the Mechanism of Exchange 
Money and the Mechanism of Exchange (New York: D. Appleton and Co. 1876).
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Measurement of Credit.
In order to measure and define exactly the amount of credit which is given or received, and to estimate the present value of a debt, we must take into account at least five distinct circumstances, which are as follows:—
Writers upon currency have been too much accustomed to mass together all kinds of credit documents, taking no account of the important results which may follow from very slight legal or customary differences. No doubt every kind of promise to pay money has a certain value, but the degree in which it may be made available to facilitate exchange varies exceedingly according to circumstances.