It is likely that many all-embracing genera11egal theories and concep tions were employed in the early development of the law. But after the for rnalliation of the law's methodology such forms of interpretation retreated to the background, yielding pride
Journal of Banking and Finance 7 (1983) 339-354. North-Holland
P O R T F O L I O MANAGEMENT OF ISLAMIC BANKS 'Certainty Model'
University of Lancaster, Lancaster LA1 4 YX, UK
Received January 1982, final version received February 1983 The Isl