**4.1 Economic aspects**

Oil plays an important role in everyday life in terms of supplying goods or food, transportation sector and labor etc. Throughout the world, the oil deposits are located in limited number of countries, many of which struggled from political and economic instabilities. In addition, the trade between oil exporters and importers are increasingly tense and vulnerable. Therefore, alcohol fuel is one of the best alternatives replacing fossil fuels. The production of alternative fuel considerably cost less because of alcohol produced from the cost effective biomass, coal and natural gas. Consequently, the production of alcohol fuel spreads into a wider geographical area, contributing to an alcohol fuel supply that is less vulnerable to disruption. Alcohol fuel also offers an opportunity for a more dispersed and equitably distributed revenue stream [14]. Therefore, for those countries with more dependencies on fossil fuels, alcohol fuel can be a more vital substitute.
