McDonald’s Big Macs can tell you more about the global economy than you might think. Forty years ago The Economist began comparing the prices of the burger around the world to judge whether currencies were too cheap or too expensive.@zannymb, our editor-in-chief, and Edward Carr, deputy editor, are joined by a panel of our economics and markets experts to discuss what the Big Max index can reveal about the global economy and the extent of the index’s shortcomings: https://t.co/UHhEChWT3k ...