“…Because they are highly unpredictable and have a direct incidence on inventories, they constitute a major source of price uncertainty in the future. Also, market effects are related to the functioning of the market itself including the following factors: levels of production and supply effects (Borensztein & Reinhart, 1994;Maizels, 1994), demand effects (FMI, 2008;Kaplinsky, 2006;Cheung & Morin, 2007), new technologies and biofuels (UNCTAD, 2009;FMI, 2007;Johnson, 2007), interest rates (Frankel, 2006), exchange rates (Ridler & Yandle, 1972;Dornbusch, 1985, Borensztein & Reinhart, 1994, and other financial effects (Irwin & Sanders, 2011;Henderson, Pearson & Wang, 2015;Tang & Xiong, 2012;Singleton, 2013).…”