As water resources become increasingly scarce in Africa, the need for the use of economics to aid in decision-making and management becomes apparent. Global experience shows that economic approaches may achieve the best ...

Based on both duality in time between time series processes and lag transformation, we define duality in causality, invertibility for mixed Autoregressive moving average ARMA(p,q) models. We construct expressions, in ...

More than half of the world's population lives within 60 km of the shoreline, and in Africa trends in population growth indicate that this figure could rise to three quarters by the next century. The lives and reasonable ...

This paper looks at the consequences of introducing heteroscedasticity in option pricing. The analysis shows that introducing heteroscedasticity results in a better fitting of the empirical distribution of foreign exchange ...