Do Dow Jones Islamic equity indices undergo speculative pressure? New insights from a nonlinear and asymmetric analysis

This paper study the exposure of Dow Jones Islamic equity indices to global risk factors while considering both effects of speculative influence and fundamental changes. The study involves future markets according to Shari'a guidelines that ban speculative trading. Nonlinear ARDL modelling approach along with dynamic asymmetric causality tests is conducted to scrutinize long‐run and short‐run asymmetries and asymmetric causalities. The used data are crude refined oil future prices to stand for fundamental chocks in speculative trading and implied volatility index to stand for speculative pressure. Obtained results approve the presence of asymmetric cointegration between Islamic equity indices and oil‐VIX future prices. The Islamic indices are sensitive to oil‐VIX future chocks both in the long run and the short run. Asymmetric causality tests indicate the existence of asymmetric causality running from crude refined oil future prices which confirm the fundamental contagion effects but the causality from VIX to Islamic indices is not pronounced at all. Results support the absence of speculative influence on Islamic indices and prove that DJIM indices corroborate with Shari'a compliant rules. In sum, the paper confirms the asymmetric cointegration and then assumes that the asymmetry is present in Islamic equity indices inherent to changes in international futures prices. The paper shows the structure of exposure to global markets' expectations and provides faith‐based investors with insights about the attitude of Islamic indices towards the future. Our findings suggest useful highlights to policymakers, portfolio managers, faith‐based investors and scholars. We then could state that if long‐run relationship occurs it is naturally asymmetrical.