The future of the world may depend on what a few thousand Pennsylvania voters think about their grocery bills

On 5 November, people around the globe will tune in to watch the world election. It's not a "world" election in the sense of the World Cup - a football championship in which many nations actively participate - but it's much more than a World Series, the curiously named baseball championship that involves only teams from North America. This year has been called the biggest election year in history. By the end of it, something approaching half the world's adult population will have had the possibility to put a cross against a name on a ballot paper. But the US…