Why you should care about the price of milk in Skopje

U.S. consumers have been paying 5.2 percent more for their food over the past year. So the BBC world service embarked upon a little global experiment to see how much consumers were being affected. Every week reporters from eight cities around the world visit the same store, buying the exact same items to compare how the price of food fluctuates over time. Guest: Richard Collings, BBC World Service Business Editor