2. Literature Review reviewed the literature on volatility contagion from bulk shipping and petrochemicals to oil prices; the other, I reviewed the literature on volatility spillover and the methodology at the center of and of the research. 2.1. Review of Petrochemical and Shipping Industries’ Influence on Oil Markets In our review of the prior literature on the petrochemical and shipping industries’ influence on oil markets, I first surveyed petrochemical commodities and oil prices. Mansur et al.