A plan to implement a 10 percent national ethanol mandate by 2020 would create an annual market for 19 billion litres. The world’s second largest ethanol producer is gearing up for a big new source of demand that will double its profit margins and could take grain prices on a ride. Grain industry analysts say China’s proposed mandate could have a huge impact on corn and other grain prices but they are stressing caution because government policy in China is unpredictable. More demand is always a better thing and it tends to support prices for corn, which tends to support prices for barley and so on.