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Cambium non est mutuum: exchange and interest rates in medieval Europe
Author(s) -
Bell Adrian R.,
Brooks Chris,
Moore Tony K.
Publication year - 2017
Publication title -
the economic history review
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.014
H-Index - 49
eISSN - 1468-0289
pISSN - 0013-0117
DOI - 10.1111/ehr.12374
Subject(s) - usury , interest rate , loan , economics , negotiable instrument , value (mathematics) , order (exchange) , interest rate parity , exchange rate , database transaction , monetary economics , financial economics , macroeconomics , philosophy , finance , mathematics , theology , islam , programming language , statistics , computer science
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 implied interest rates from exchange rates. The analysis presented in this article 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.