Poor countries tend to have out one-tenth of the crop yield per hectare compared to the yield from rich countries. Farmers in rich countries are more productive than those in poor countries because they use better technology and infrastructure, and are subject to better government policies.

If all the world’s farmers extracted the maximum potential output from their fields, the gap in yields between rich and poor countries would vanish almost entirely.

So what would it take for the developing world to catch up?

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