“…The short-end factor captures the short-term variations, 5 while the shape and long-end factors have the ability to capture medium-and long-term variations in a flexible way. The second strand studies the relation between commodity spot or future prices, and spot volatility with economic variables by using equilibrium models (Casassus et al (2013), Chiang et al (2015), Gao, Hitzemann, Shaliastovich, and Xu (2017), Heath (2019)), or VaR models (Alquist and Kilian (2010), Symeonidis, Prokopczuk, Brooks, and Lazar (2012), Silvennoinen and Thorp (2013), Kilian and Murphy (2014), Cheng and Xiong (2014), Anzuini, Pagano, and Pisani (2015), Kilian (2016), Prokopczuk, Stancu, and Symeonidis (2019), Hollstein, Prokopczuk, and Wuersig (2019)). Typically, short-term price variations are associated with demand variables in the physical markets and trading variables in the futures markets.…”