In commodity markets, it’s not uncommon for high demand to cause sharp increases in prices; on short notice, it’s often hard to match the new demand with more supply. The question is whether supply, and trade, can grow to offset market tightness.

Image Filipino port workers unload sacks of rice imported from Vietnam to be distributed by the National Food Authority. Credit... Alanah Torralba/European Pressphoto Agency

Restrictions on the rice trade run the risk of making shortages and high prices permanent. Export restrictions treat rice trade and production as a zero- or negative-sum game where one country’s gain comes at the expense of another. That’s hardly the best way to move forward in a rapidly growing world economy.

This lack of support for trade reflects a broader and disturbing trend. An increasing percentage of the world’s production, including that for agriculture, comes from poor countries. Over all, that’s good for rich countries, which can focus on creating other goods and services, and for the poor countries, which are producing more wealth. But it can slow the speed of adjustment to changing global conditions.

For example, if demand for rice rises, Vietnamese farmers  who remain shackled by many longstanding regulations of communism  aren’t always able to respond quickly. They don’t even have complete freedom to ship and trade rice within their own country.

Poorer countries also tend to be the most protectionist. To make matters worse, about half of the global rice trade is run by politicized state trading boards.

The reality is that many of today’s commodity shortages, including that for oil, occur because ever more production and trade take place in relatively inefficient and inflexible countries. We’re accustomed to the response times of Silicon Valley, but when it comes to commodities production, many of the relevant institutions abroad have only one foot in the modern age. In other words, the world’s commodities table is very far from flat.

Many poor countries, including some in Africa, could be growing much more rice than they do now. The major culprits include corruption in the rice supply chain, poorly conceived irrigation systems, terrible or even nonexistent roads, insecure property rights, ill-considered land reforms, and price controls on rice.