One estimate proposes that if food prices rise by one third they will decrease living standards in rich countries by about three percent however in very poor ones by about twenty percent. According to the International Food Policy Research Institute, except there is a change in policies cereal prices will rise by 10-20 percent by 2015, as well as the expansion of bio-fuel production could reduce calorie intake by 2-8 percent by 2020 in many of the world's poorest nations. Must rich countries do anything about this potential problem? If so, what?