Food prices and social unrest

You don't hear about it much, but there may be an underlying cause to many of the riots across the globe: the price of food:

What causes riots? That's not a question you would expect to have a simple answer.

But today, Marco Lagi and buddies at the New England Complex Systems Institute in Cambridge, say they've found a single factor that seems to trigger riots around the world.

This single factor is the price of food. Lagi and co say that when it rises above a certain threshold, social unrest sweeps the planet.

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