Ajmi, Ahdi N.; Gupta, Rangan; Kruger, Monique; … - Department of Economics, Faculty of Economic and … - 2014
oil prices. A nonlinear Granger causality test based on moment conditions, introduced by Nishiyama et al (2011) is … employed and we find that there is indeed a causal relationship between global oil prices and certain South African … oil prices also cause volatility of wheat, sunflower seed and sorghum prices. …