The world’s great cities could hold the key to the prosperity of the human race. Yet a comprehensive new study points to a worrying trend: The water they need to grow is getting more expensive, because they’re failing to protect the nature that purifies it. Cities are amazing engines of productivity. As the hubs of our modern societies, they …

  Many politicians and commentators are calling for a big burst of spending on infrastructure. On his blog, my esteemed Bloomberg View colleague Tyler Cowen raises an interesting question: What is the opportunity cost of government spending — that is, what is the value of the other uses to which the money and resources could be put? To answer this …

  Bloomberg World stock markets largely retreated on Wednesday, with all eyes on the Federal Reserve as it prepares to offer further clues as to the timing of the next US rate rise. European indices fell back after opening higher, although London’s losses were capped by brighter-than-expected unemployment figures that calmed fears surrounding Brexit’s economic fallout. Tokyo was the only …