Accessibility navigation

Cambium non est mutuum: exchange and interest rates in medieval Europe

Bell, A. R. ORCID:, Brooks, C. ORCID: and Moore, T. K. (2017) Cambium non est mutuum: exchange and interest rates in medieval Europe. The Economic History Review, 70 (2). pp. 373-396. ISSN 1468-0289

Text - Accepted Version
· Please see our End User Agreement before downloading.


It is advisable to refer to the publisher's version if you intend to cite from this work. See Guidance on citing.

To link to this item DOI: 10.1111/ehr.12374


A major gap in our understanding of the medieval economy concerns interest rates, especially relating to commercial credit. Although direct evidence about interest rates is scattered and anecdotal, there is much more surviving information about exchange rates. Since both contemporaries and historians have suggested that exchange and rechange transactions could be used to disguise the charging of interest in order to circumvent the usury prohibition, it should be possible to back out the interest rates from exchange rates. The following analysis is based on a new dataset of medieval exchange rates collected from commercial correspondence in the archive of Francesco di Marco Datini of Prato, c.1383-1411. It demonstrates that the time value of money was consistently incorporated into market exchange rates. Moreover, these implicit interest rates are broadly comparable to those received from other types of commercial loan and investment. Although on average profitable, the return on any individual exchange and rechange transaction did involve a degree of uncertainty that may have justified their non-usurious nature. However, there were also practical reasons why medieval merchants may have used foreign exchange transactions as a means of extending credit.

Item Type:Article
Divisions:Henley Business School > ICMA Centre
ID Code:57199


Downloads per month over past year

University Staff: Request a correction | Centaur Editors: Update this record

Page navigation