The big increase in food prices over the last six months or so raises lots of issues, of which I’ll try to cover a few.
The first arises from the fact that prices for commodities, including oil as well as most ag commodities, are typically quoted in $US. In a situation where, for obvious reasons, the value of the $US is declining against all major currencies, this can be quite misleading. Measured against the euro, the currency of the world’s largest unified economy, the increase looks a lot less steep. The declining usefulness of the $US as a unit of account is another step in the process of transition away from a world in which the $US is a reserve currency. More on what will replace it soon, I hope.
In substantive terms, the increase in $US commodity prices is a big problem for the many Asian economies that have pursued some kind of peg to the $US as a means of maintaining export competitiveness. The adverse impact on domestic consumers is now becoming obvious, and the only solution is to abandon the dollar peg and allow an appreciation. China is already moving in this direction.
A second important point is the impact of demand from the biofuel sector, particularly for corn in the US. The idea of making biofuels from food crops was always problematic and the subsidy regime in the US makes it more so. The current food crisis should make subsidies for food-based biofuels politically and economically untenable, pushing the industry away from this easy short term solution and in the direction of sources such as switch grass, grown on marginal or non-arable land.
Finally, the biggest increases have been in wheat prices, reflecting the drought in Australia and in some other wheat producing countries (Kazakstan?). It seems likely, though it’s still impossible to prove, that human-induced climate change is increasing the frequency and severity of drought. So, it’s important not to regard climate change as a problem for the future. In all probability, adverse effects are already here.