a) Global imbalances have reemerged over the last few years (though this is more obvious from summing the surpluses of surplus countries than from summing the deficits of deficit countries): “… a sustained era of balanced growth failed to emerge [after the global crisis]. Instead, surpluses in China and Japan rebounded. In recent years Europe has followed, thanks to a big switch from borrowing to saving.”
b) Those imbalances are a big reason why interest rates globally are low: “Once a few economies become stuck in the zero-rate trap, their current-account surpluses exert a pull which threatens to drag in everyone else.”
I have only one small quibble. The rise in Asia’s surplus didn’t just come immediately after the crisis. There was also a significant rise in Asia’s surplus from 2013 to 2015.
Indeed, in 2015, East Asia’s combined surplus actually significantly exceeded that of Europe, adding to the world’s difficulty generating enough demand growth even with ultra-low rates.*
Yes, some of this is oil. But the oil exporters in aggregate aren’t running large external deficits financed by their high saving customers (Russia is in surplus; the Saudis are more an exception than the rule). The IMF puts the aggregate deficit of the main oil exporting regions of the world economy (the Middle East, North Africa, Russia and Central Asia) at $50-100 billion, substantially less than the combined surplus of Europe and Asia. So it isn’t all oil either.
China’s unloved, credit-based stimulus, together with the large reported increase in tourism spending (whether real or fake), looks set to pull China’s surplus down a bit in 2016. But China will retain a surplus of over $200 billion in 2016, and ongoing surpluses in Korea, Taiwan, Singapore and Japan will keep Asia’s aggregate surplus high. I would bet East Asia’s aggregate 2016 surplus will still exceed that of Europe.