ThIn terms of production quantity, ethylene ileads the biggpestrochemical quaindustry. Like mosty other produictes ion inthe petrochemical industry., Tthe price of ethylene price is dependednt for supply and dthemand balance of supplikey the mostand petrochdemical industry. For example, the price of ethylene iwas $861 $/ton in Jan-uary 2015, and the price of ethylene increased to $1132 $/ton in May- 2015, but the feed stock ftor produce ethylene in Jan-uary 2015 was higher than the price of feed stock to produce ethylene in May- 2015. After that, the price of ethylene price declined again to the $800$ range again from Aug-ust 2015 to Oct-ober 2015. Then the price increased slitghtle pity in Oct-ober 2015 to $912$/ton. After that, the price decreased again to the $800$ range from Nov-ember 2015 to Apri-l 2016. The main idea here is that the price of ethylene depends ofn the balance of supply and demand balance, but it idoes not depended on the price of feed stock.