Put another way, ten years ago the US engine could drive the world economy, and ten years from now the emerging-market countries stand to take over that role, particularly given the rising purchasing power of their middle classes. But, for now, America and Europe cannot expand their consumer spending without increasing exports, while China and the emerging markets cannot easily expand their production or consumption without the guarantee of strong Western markets.
换句话说，10年前美国引擎足以驱动全球经济，而未来10年内随着新兴市场国家中产阶层消费力的不断增强，它们将最终占据这一角色。但目前为止欧美都无法在不增加进口的情况下增加消费，而中国以及其他新兴市场也不能在缺乏西方强劲市场的情况下扩展其生产或消费。