So the US is not just one economy in a world of economies following their own monetary policies under a flexible exchange-rate regime. The US is, rather, a global hegemon: the central bank for the world, with a responsibility not just to stabilize output, employment, and inflation and ensure financial stability in the US, but also to manage the world economy in its entirety.
因此美国不仅仅是全世界众多经济体中其中一个在弹性汇率体系下遵从其货币政策的国家。美国更像是一个全球霸权：全世界的中央银行，其职责不仅是稳定本国的生产，就业，通胀及确保金融稳定，也包括管理作为一个整体的世界经济。