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When considering the petroleum classification it is important to consider the fact that the overall classification will have an effect on the value, not just the physical properties. For example, petroleum with a geographical classification from one region of the world may be expensive to transport to another region of the world regardless of the suitability of the raw petroleum as an overall substance. In general, lighter crude commands a higher price because it contains more hydrocarbon chains that can be easily refined to make gasoline and diesel, which are in high demand. The lower the sulphur content, the higher the price as well because low-sufur, sweet crude requires less refining