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This paper aims to contribute to the literature debate on the regulators’ dilemma affecting international financial regulations focusing on the banking regulation of dual financial systems. In this regard, the paper provides a new taxonomy of Islamic Financial Systems considering the banking regulation as a driver for the classification and a more detailed definition of dual financial systems. The literature review reveals the existence of different financial system structures affected by socio-cultural biases due to different characteristics of various countries and financial systems globally. The risk of regulatory arbitrage or over-regulation phenomena is high, stifling the growth and the level playing field for both some systemically financial systems.

PurposeThe main objective of this paper is to analyze works of literature on SRI sukuk to highlight the potential for these kinds of instruments in financing more sustainable financial systems (SFSs). The analysis mainly accentuates a dearth of knowledge on the various challenges and opportunities in the realm of SRI.Design/methodology/approachThis paper pioneers the bibliometric and systematic literature review of the development of the SRI sukuk from 2016 (the first available year in the field) to and 2021.FindingsThe study findings highlighted several pertinent SRI issues: the lack of standardization due to the different interpretations of Shariah and green, the lack of retail investors, which inevitably produce a lack of liquidity in the secondary market, thus limiting their growth, its funding allocation’ close resemblance to green financing, and the role of Malaysia and Indonesia as global sustainable financial hubs to stimulate the development of Shariah-compliant sustainable instruments and contribute to the international debate about the building of a global standardized framework related to sustainable investments.Originality/valueThe integration of the environmental principles of a green bond with the Shariah-compliant financial structure of a sukuk, the SRI sukuk, represents a vital crossroad in both sustainable and Islamic finance. Social-impact sukuk and green sukuk is an undervalued instrument that could play an important role in financing a more sustainable economic and financial system, including Islamic investing. This kind of instruments, which is based on a “pay for success” principle in the conventional layout, perfectly fit with the profit-and-lost sharing’s (PLS's) ethicality, the sustainability principles of Islamic finance and the religious principles of Islamic law.

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