The Becker-Posner Blog: Will World Food Prices Resume their Sharp Increase?
... World prices of food generally declined during the 20th century when world population and world GDP per capita grew enormously. The reason for these diverse trends is that productivity in the production of food expanded at a more rapid rate than did the demand for food. The advances in production were due to the use of new and more effective fertilizers, better farm machines, and many applications of scientific knowledge to improving the productivity of agriculture. Developed countries spent considerable resources on subsidies to farmers to help keep their prices up, not down. Even though it may not be possible to predict the exact nature of future agricultural innovations, one can reasonably expect similar growth in world farm output during the next several decades, especially if food prices rise by a significant amount.
Rapid growth in future world GDP is likely to greatly raise the prices of oil and other fossil fuels, unless concerns about global warming induce major steps to reduce the demand for these fuels. Rapid growth in world output is also likely to sharply raise the demand for cereals, meat, and other foods in developing countries. However, I have tried to show why food is different from fossil fuels and minerals, like copper, in that the supply of food is not limited by natural bounds on overall quantity. Rather, the efforts and ingenuity of farmers and researchers are able to greatly increase world food supply to meet even very large increases in the world demand for food.
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