I have read a lot of books and articles recently about supply and demand relating to food. In the United States, since the mid-20th century, there has been a huge increase in quantity supplied in food, which instead of feeding everyone has really messed around with prices. Now, instead of being paid to maintain steady amounts of supply, farmers are paid to produce as much as they can, but then need subsidies to make enough to live on. It's weird, but we almost have too much food now. Some people even think this problem will get worse or will become an issue in other parts of the economy as well.