Global imbalances are once again taking shape, albeit differently than how they manifested before the financial crisis of the late 2000s. Back then, the story was simple: some countries, led by China and Germany, saved too much, while the United States consumed too much. The answer, at least in theory, was also simple: surplus countries should rely more on domestic demand while deficit countries should save more; exchange rates should adjust. While that framework still matters, it no longer...