There are many reasons why oil price change the main reason is OPEC because there are 12 country control 40 percent for oil price. The formation of OPEC marked a turning point toward national sovereignty over natural resources, and OPEC decisions have come to play a prominent role in the global oil market and international relations.
The second reason is demand and supply for oil because economic growth .Many people want to produce in industry. They use oil to produce many things. It makes oil price increasing but if economic goes down it makes oil price decreasing.
The last reason is climate .Oil demand may change with the seasons, such as the US and Europe which is a major oil users. The demand of winter season is high because it want to make warm. Particularly in severely cold weather than usual while summer ,Oil demand has not decreased. But turning to fuel demand for tourist traffic in the region.