“…Within the existent economic literature, the approachess used to study price relationships follow different conceptual frameworks (Bakhat and Würzburg, 2013). In this study, we applied time series models to estimate the dynamic relationships between vegetable oil prices (Myers, 1992;Balbás et al, 2005;Taylor, 2008;Anderson, 2011;Asari et al, 2011;Bentivoglio et al, 2014;Chatfield, 2016;Bentivoglio et al, 2016). Different characteristics are relevant to implement a time series model: the presence of stochastic trend (unit roots) and cointegration.…”