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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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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