Crude oil is a naturally occurring petroleum product, commonly used in energy production and manufacturing. Crude oil is often purchased to be refined to produce daily diesel, gasoline, fuel oil, jet fuel, plastics, cosmetics, medicines and fertilizers. So the impact on the global economy is huge. In general, rising oil prices tend to weaken economic growth as they increase the cost of travel and transportation, raising inflationary pressures and generally stalling personal consumption. The two main categories of crude oil are American oil, commonly known as west Texas intermediate (WTI) and British petroleum, or brent. Both crude oils are characterized by “low viscosity” and “low sulfur,” indicating their low density (which makes refining and transportation easier) and low sulfur content (which makes them less impurities and cheaper to refine). As a result, they are closer to the desired end product than other “high viscosity” and “acid” crude oils, and tend to be more expensive.