But when food gets scarce, Hertel says, markets do respond.

但是赫特尔指出，当粮食变得极度短缺时，市场会做出反应。

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Markets will balance supply and demand for food, Hertel says.

市场会平衡粮食供需，赫特尔说。

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But when food gets scarce, Hertel says, markets do respond.Prices go up, farming gets more profitable, and farmers grow more food.

但是Hertel称，当食物缺乏时，市场肯定会有反应：价格上涨、农业利润更丰厚以及农民扩大食物种植。

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As a result, according to a new study by Thomas Hertel, of Purdue University, and Will Martin, of the World Bank, rich countries' average tariffs on manufacturing imports from poor countries are four times higher than those on imports from other rich countries.

ECONOMIST: Trade and development