Cereal numbers: the fall in food prices

The worst predictions for costs have not come to pass, partly because Russia is selling plenty of wheat. But plenty of food-price woe may still await. We examine the curious re-appearance of the polio virus in the West. And the trials of “Pink Sauce” reveal the perils of being a cottage-food producer—or consumer—in the social-media age.For full access to print, digital and audio editions of The Economist, subscribe here www.economist.com/intelligenceoffer