The French are already complaining that their beloved baguette costs too much. Photo / Bloomberg

The French are already complaining that their beloved baguette costs too much. Photo / Bloomberg

Parisians are bemoaning the price of a baguette, Italians have organised a pasta boycott and the people in Mexico have held street protests about the cost of tortillas.

Rocketing food prices are infuriating consumers and putting pressure on politicians worldwide. But is this a temporary blip or has the era of cheap food come to an end?

Part of the problem is short term. Catastrophic droughts and very poor harvests in many of the world's largest food-growing regions, including Australia, have driven up the price of grains, particularly wheat. In Britain, meat prices may also rise if the foot-and-mouth crisis continues.

But there are long-term, more structural forces at work - high oil prices and the desire to tackle global warming have led to an explosion in demand for biofuels based on food crops.

Farmers are finding it that it's more profitable to grow fuel than grow food. In the United States alone, where plant-based ethanol receives generous federal subsidies, this year's maize crop is 20 per cent larger than it was last year as a result of the biofuel boom.

The more grains are turned over to biofuel, the less is left for food. That pushes up prices, affecting the cost of staples such as bread and tortillas.

And because grain is often fed to livestock, it also affects meat prices.

"There's a huge knock-on effect," says Kona Haque, senior commodities editor at the Economist Intelligence Unit. She calculates that maize prices will rise an average of 36 per cent this year, and wheat prices 18 per cent.

The Organisation for Economic Co-operation and Development, in a report published jointly with the United Nations, said the biofuel bonanza could push food prices above their long-term averages for a decade.

There are also fears that if unusual weather becomes more common, bad harvests could become frequent - although the International Panel on Climate Change says small temperature rises will increase crop yields in some climate zones.

The growing affluence of China and India, and the resulting increase in demand for food, is giving another boost to food prices.

But that is a slow process. China consumed 18 per cent of the world's maize production in 1997. This year, after a decade of extraordinarily rapid economic growth, it will swallow 19 per cent.

Mark Price, boss of upmarket supermarket chain Waitrose, takes the long view, saying that although wheat prices have risen 90 per cent in two years, that followed a decade-long fall, and prices were now similar to those reached in 1997. He said that lower-price supermarket chains could absorb commodity price rises only by lowering the amount of quality ingredients in their products.