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Rising prices, powerful storms, severe droughts and floods, and other unexpected events are likely to play havoc with the fabric of global society.

The world's population will grow from almost 7 billion now to over 9 billion in 2050. Will be enough food to go round?

In proposing measures to curb erratic swings in food prices, global leaders have conflated high prices with unstable ones. That's a mistake. In fact, the real problem is expensive food, so policies aimed at curbing volatility -- such as export bans, price stabilization schemes, and subsidies for farmers -- won't help those who need it.