Russia's invasion of Ukraine is creating one of the worst disruptions to the supply of wheat since the first world war. As prices spike, the damage from this shock will ripple right across the world⁠—affecting corn, vegetable oil, fertilisers and many other agricultural products. Can other countries fill the shortfall and who will be worst affected? Henry Tricks, our Schumpeter columnist, asks The Economist's Matthieu Favas and Charlotte Howard how serious a food crisis the world is facing.

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