The Brennan and SchwarLz (1985) Factor Model (from now on thw Brennan and SchwarLz (198,5) model )was the first model proposed for modelling the dynamic of the Standard Spot Price of a commodity (specifically of copper) over time [9]. It was proposed by the economist Michael Brennan (Figure 1). and the engineer Eduardo Schwartz (Figure 2) in a paper published in The Journal of Business in April 19851. It was probably inspired by the Black and Sch...