Surging costs hit food security in poorer nations

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The U.N. Food and Agriculture Organization's food price index — which includes grains, meat, dairy and other items in 90 countries — was up 22 percent in March from a year earlier though still below 2008 levels. In some Asian markets, rice and wheat prices are 20 to 70 percent above 2008 levels, it says.

Many governments blame dry weather and high fuel costs but critics in countries such as India, Argentina and Egypt say misguided policies are making shortages worse and collusion by suppliers might be pushing up prices.

No single factor explains the inflation gap between developing and developed countries but poorer economies are more vulnerable to an array of problems that can push up prices, and many are cropping up this year.

Farmers with less land and irrigation are hit harder by drought and floods. Civil war and other conflicts can disrupt supplies. Prices in import-dependent economies spike up when the local currency weakens, as Pakistan's rupee has this year.

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