[...]It is a tale of two peoples. In one version of the story, a country with a lot of poor people suddenly experiences fast economic expansion, but only half of the people share in the new prosperity. The favored ones spend a lot of their new income on food, and unless supply expands very quickly, prices shoot up. The rest of the poor now face higher food prices but no greater income, and begin to starve. Tragedies like this happen repeatedly in the world.
[...]Much discussion is rightly devoted to the division between haves and have-nots in the global economy, but the world’s poor are themselves divided between those who are experiencing high growth and those who are not. The rapid economic expansion in countries like China, India and Vietnam tends to sharply increase the demand for food. This is, of course, an excellent thing in itself, and if these countries could manage to reduce their unequal internal sharing of growth, even those left behind there would eat much better.
But the same growth also puts pressure on global food markets — sometimes through increased imports, but also through restrictions or bans on exports to moderate the rise in food prices at home, as has happened recently in countries like India, China, Vietnam and Argentina. Those hit particularly hard have been the poor, especially in Africa.
There is also a high-tech version of the tale of two peoples. Agricultural crops like corn and soybeans can be used for making ethanol for motor fuel. So the stomachs of the hungry must also compete with fuel tanks.
[...]The global food problem is not being caused by a falling trend in world production, or for that matter in food output per person (this is often asserted without much evidence). It is the result of accelerating demand. However, a demand-induced problem also calls for rapid expansion in food production, which can be done through more global cooperation.
[...] While population growth accounts for only a modest part of the growing demand for food, it can contribute to global warming, and long-term climate change can threaten agriculture. Happily, population growth is already slowing and there is overwhelming evidence that women’s empowerment (including expansion of schooling for girls) can rapidly reduce it even further.
What is most challenging is to find effective policies to deal with the consequences of extremely asymmetric expansion of the global economy. Domestic economic reforms are badly needed in many slow-growth countries, but there is also a big need for more global cooperation and assistance. The first task is to understand the nature of the problem.