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BIC Excellence Award

The Economy of Certainty
An Introduction to the Typology of Islamic Legal Theory

By Aron Zysow

The Economy of Certainty
Paperback, 360 pages £30.00
Published: 2013
ISBN: 9781937040093
Format: 254mm x 178mm
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Subjects: Arabic and Islamic Studies, Lockwood Press
Series: Resources in Arabic and Islamic Studies

Aron Zysow's 1984 PhD dissertation, 'The Economy of Certainty,' remains the most important, compelling, and intellectually ambitious treatment of Islamic legal theory (usul al-fiqh) in Western scholarship to date. It continues to be widely read and cited, and remains unsurpassed in its incisive analysis of the fundamental assumptions of Islamic legal thought.

Zysow's important work is published here in full, for the first time, with updated references, further reflections by the author, and with the addition of a nine-page Foreword by Robert Gleave.

Zysow argues that the great dividing line in Islamic legal thought is between those legal theories that require certainty in every detail of the law and those that will admit probability. The latter were historically dominant and include the leading legal schools that have survived to our own day. Zahirism and, for much of its history, Twelver Shi'ism, are examples of the former.

The well-known dispute regarding the legitimacy of juridical analogy is only one feature of this fundamental epistemological division, since probability can enter the law in the process of authenticating prophetic traditions and in the interpretation of the revealed texts, as well as through analogy. The notion of consensus in Islamic legal theory functioned to reintroduce some measure of certainty into the law by identifying one of the competing probable solutions as correct. Consequently, consensus has only a reduced role in those systems that reject probability. Another, more radical, means of regaining certainty was the doctrine that regarded the legal reasoning of all qualified jurists on matters of probability as infallible. The development of legal theories of both types was to a large extent shaped by theology and, most significantly, by Mu'tazilism, and subsequently by Ash'arism and Maturidism.

Series Editor's Preface


Author's Preface




1. The Authentication of Prophetic Traditions

2. Interpretation

3. Consensus

4. Analogy




Works Cited in the Addenda and Preface

Table of Page Correspondences

Index of Qur'än Citations

Index of Arabic Terms and Proper Names

'The importance of The Economy of Certainty to the study of Islamic legal theory is a tribute to the precision employed at its inception…. In many disciplines, thirty-year-old research borders on being antique; however, when read today, Zysow’s presentation retains both its originality and its authority…. It has been read and reread by those working on us.u-l, and now, hopefully, those working in linked fields of enquiry will be able to benefit from Zysow’s masterly account of the epistemological and theological factors which make us.u-l al-fiqh such adistinctive and absorbing theory of law.'  (Robert Gleave, University of Exeter)

'It is no exaggeration to say that Zysow's contribution is the single most important work on Islamic legal theory (us.u-l al-fiqh) in any western language.' (Marc Herman, Center for Jewish Law and Contemporary Civilization)

Aron Zysow received his A.B. (Classics), Ph.D. (Islamic Studies), and J.D. from Harvard. From 2000 to 2005 he served as Research Associate for the Islamic Legal Studies Program at Harvard Law School. Before that he taught Arabic and Islamic Studies at the University of Washington in Seattle and Washington University in St. Louis and commercial law at Baruch College, City University of New York. Prior to his academic career he worked as an attorney in New York City. His main academic interests are Islamic law, particularly legal theory, and theology. He is a former fellow of The Institute for the Transregional Study of the Contemporary Middle East, North Africa and Central Asia (TRI) at Princeton University, where he also taught in the Department of Near Eastern Studies.

Publication Details:

 Paperback , 360 pages
 254mm x 178mm

BIC Code:
  LAW060000, PHI003000, PHI022000, REL037020, REL037030
 Lockwood Press


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