Why rice is so expensive.

Tyler Cowen:

The damage that trade restrictions cause is probably most evident in the case of rice. Although rice is the major foodstuff for about half of the world, it is highly protected and regulated. Only about 5 to 7 percent of the world’s rice production is traded across borders; that’s unusually low for an agricultural commodity.

So when the price goes up — indeed, many varieties of rice have roughly doubled in price since 2007 — this highly segmented market means that the trade in rice doesn’t flow to the places of highest demand.

Poor rice yields are not the major problem. The United Nations Food and Agriculture Organization estimates that global rice production increased by 1 percent last year and says that it is expected to increase 1.8 percent this year. That’s not impressive, but it shouldn’t cause starvation.

The more telling figure is that over the next year, international trade in rice is expected to decline more than 3 percent, when it should be expanding. The decline is attributable mainly to recent restrictions on rice exports in rice-producing countries like India, Indonesia, Vietnam, China, Cambodia and Egypt.

And the same is true of other commodity shortages.