RT Journal Article SR Electronic T1 Islamic Investment and the Cost of Observance JF The Journal of Investing FD Institutional Investor Journals SP 101 OP 109 DO 10.3905/joi.2011.20.2.101 VO 20 IS 2 A1 Omar Al-Shakfa A1 Gregory Lypny YR 2011 UL https://pm-research.com/content/20/2/101.abstract AB There is no overriding reason why restrictions on investment choice imposed by religious or social interest must necessarily disadvantage those who adhere to them provided that there is sufficient diversity in the choices that remain. We examine this issue empirically with a sample of over 1,000 risk-matched Secular and Islamic-compliant portfolios comprised of S&P 500 stocks and find that the expected cost of observing Islamic investment principles is positive. And while returns shift sharply in favor of Islamic portfolios out-of-sample, a considerably larger fraction of the Secular portfolios that had been identified as dominant in the estimation period continue to outperform.TOPICS: ESG investing, style investing, portfolio construction