There are different policy based instruments that can affect markets in order to fulfilled objectives. The justification of this interventions is based on the role that different externalities play in the market development of these commodities. In the case of bioenergy, this is a fundamental topic that largely affects its implementation. There are different tools, from more aggressive approaches such as quotas and restrictions, to more subtle as promotion campaigns, green labeling or even research grants. Two commonly used instruments have been subsidies and taxes. Both act of the supply and demand curves, modifying the equilibrium points, and restricting or expanding the amount of the commodity in the market and their prices. This effect, however, is not equally distributed between the producer and the consumer, as it is related to the elasticity of the curves. The study of the elasticity will therefore help in assessing which agent, producer or consumer, obtains the main benefit (in case of subsidies) or carries the main burden (in case of taxes).