For meaningful biofuel analyses we included also other MAGNET modules in the model. Necessary is the flexible production structure to enable substitution between biomass based ethanol and biodiesel on the one hand, and crude oil based petrol and diesel on the other hand. Including the by-products from the production of biodiesel and ethanol, such as DDGS, molasses and oil cakes, is highly relevant for the analysis of biofuel support policies. Other characteristics of the agricultural sector are also important, such as the segmented mobile factor markets (as agricultural factor prices deviate from these prices in other sectors) and all agricultural policies.