Ahmet Sensoy

Systematic Risk in Conventional and Islamic Equity Markets

We aim to compare the systematic risk in conventional and Islamic equity markets by introducing two dynamic risk measures. Accordingly, the level of the systematic risk in conventional markets is slightly higher than the risk in Islamic markets for most of the time. However, this difference is significant in less than 3% of the sample period. More importantly, there is no significant difference in the levels of systematic risk during the global financial crisis of 2008, suggesting that Islamic equities are not able to provide a lower market risk compared with their conventional counterparts in financial turbulent times.

Analysing dynamic linkages and hedging strategies between Islamic and conventional sector equity indexes

ABSTRACT This study analyses the dynamic spillovers across 10 Dow Jones Islamic and conventional sector index pairs. Using various multivariate GARCH models, the results show significant time-varying conditional correlations for all the pairs. Moreover, there is evidence that the conditional correlations for all the sector pairs, except those of the Telecommunication and Utilities sectors, increase after the onset of the global financial crisis (GFC), suggesting non-subsiding risks, contagion effects and gradual greater financial linkages. The Islamic sectors’ risk exposure can be effectively hedged over time in diversified portfolios containing conventional sector stocks. These results provide several practical implications for portfolio managers and policymakers in regard to optimal asset allocations, portfolio risk management and the diversification benefits among these markets.

European Economic and Monetary Union Sovereign Debt Markets

This paper focuses on developments in the European Economic and Monetary Union sovereign debt markets in the past decade. The ?rst part analyzes the integration and segmentation structure of the bond markets of the Economic and Monetary Union before and after the sovereign debt crisis, by introducing the novel concept of correlation-based stable networks. Accordingly, a fair integration is observed between the bond markets during the pre-crisis period. However, a strict segmentation emerges, separating the members struggling with debt problems and the ones with relatively strong ?scal performances during the sovereign debt turmoil. The segmentation structure is clearly visualized, revealing the potential paths for crisis and recovery transmission in the future. In the second part, the paper comments on the recent decreasing trend in Economic and Monetary Union member bond yields and their increasing degree of co-movement. Accordingly, the paper argues that these changes do not depend on the ?scal performances of the member countries, but depend on the illusion of quality that appeared with the Fed (U.S. Federal Reserve) tapering signals in early 2013.

Impact of sovereign rating changes on stock market co-movements: the case of Latin America

ABSTRACT We aim to determine if long-term foreign currency sovereign rating assessments (from S&P, Moody’s and Fitch) for the advanced emerging Latin American countries (Brazil, Mexico and Chile) have any significant effect on the correlation between their stock market returns in the last decade. With that purpose in mind, we obtain the time-varying correlation by cDCC modeling using ARX-APARCH filtered returns. The analysis shows that the rating changes do not have a significant effect on the correlations in general. After testing for robustness, we reveal that an upgrade to an investment grade level for a country is more likely to positively diversify it from others in the region instead of creating a common positive regional investment environment. Results have important implications for investors and policymakers.

ONE-DIMENSIONAL LONG RANGE WIDOM–ROWLINSON MODEL WITH PERIODIC PARTICLE ACTIVITIES

In this paper, we consider a one-dimensional long range Widom–Rowlinson model when particle activity parameters are periodic and biased. We show that if the interaction is sufficiently large versus particle activities then the model does not exhibit a phase transition at low temperatures.