A 2009 study used an IFPRI model to estimate the biofuel contribution to 2006-8
food price increases, concluding that worldwide biofuel production had pushed up corn
prices by 27 percentage points and that U.S. biofuels production increased corn prices by
more than 22 percentage points (Baier, Clements et al. 2009). In terms of global food
prices, they found that just over 12% of the rise in the IMF’s food price index could be
attributed to biofuels, but that 60% of that contribution came from U.S. biofuels
production (Baier, Clements et al. 2009).