Comparative Testing of Capital Asset Pricing Model (CAPM) and Shari’a Compliant Asset Pricing Model (SCAPM): Evidence from Karachi Stock Exchange - Pakistan

Abstract

CAPM is most widely used economic model for pricing of securities, although criticized on different basis and alternative CAPM’s were developed in the hope of better explanatory power. Islamic finance has shown remarkable performance and growth in first decade of 21st century. In order to increase liquidity Islamic finance practitioners have entered in stock market and by 2008 nine Islamic indexes are operating worldwide. Risk free return is not accepted in Islamic financial literature hence traditional CAPM is not suitable for security valuation for Sharia compliant investments. Hanif (2011) presented a Sharia compliant asset pricing model (SCAPM) for valuation of Sharia compliant securities. The purpose of this study is to test the CAPM and SCAPM comparatively on KSE-100 to document the results and present findings as which of the model explain more variation in stock returns. Study period covers nine years (Jul 2001- Jun 2010). For calculation of returns historical prices of securities and market index is used. Portfolio technique (based on market capitalization) was used for analysis and results obtained through OLS. Findings of the study are very interesting to researchers as well. No significant results found in higher and lower capitalization portfolios under any of the model, however results were statistically significant for middle capitalization portfolio and explanatory power of SCAPM was better than CAPM.