Mongi Arfaoui

Oil, gold, US dollar and stock market interdependencies: a global analytical insight

This paper takes a global perspective in examining relationships among oil, gold, US dollar and stock prices, using simultaneous equations system to identify direct and indirect linkages for the period spanning from January 1995 to October 2015. Results show significant interactions between the all parties. Indeed, we found negative relation between oil and stock prices but oil price is significantly and positively affected by stock markets, gold and USD. Oil price is also affected by oil future prices and by Chinese oil gross imports. Gold price is concerned by changes in oil, USD and stock market prices but slightly depend on US oil imports and corporate default premium. The US dollar is negatively affected by stock market and significantly by oil and gold prices and also by US consumer price index. Indirect effects always exist which confirm the presence of global interdependencies and involve the financialization process of commodity markets.

Return Dynamics and Volatility Spillovers Between FOREX and Stock Markets in MENA Countries: What to Remember for Portfolio Choice?

Abstract This article investigates the interdependence of stock-forex markets in MENA (Middle East and North Africa) countries for the February 26, 1999 to June 30, 2014 period. The analysis has been performed through three competing models: the VAR-CCC-GARCH model of Bollerslev [1990]; the VAR-BEKK-GARCH model of Engle and Kroner [1995]; and the VAR-DCC-GARCH model of Engle [2002]. Our findings confirm that both markets are interdependent and corroborate the stock and flow oriented approaches. We also find that, comparing to optimal weights, hedge ratios are typically low, denoting that hedging efficiency is quite good. Our estimation of hedging efficiency suggests that incorporating foreign exchange in a full stock, unhedged portfolio increases the risk-adjusted return while reducing its variance. (We note here that the forex market is overweighted for both portfolio allocations and hedging strategies.) Moreover, this conclusion holds for all countries in all three models.