"Under the ECB's QE program, which started in March 2015, eurozone members' central banks buy private market securities for €1.74 trillion ($1.84 trillion), with more than €1.4 trillion to be used to purchase their own countries' government debt.

The QE program seems to be symmetrical because each central bank repurchases its own government debt in proportion to the size of the country. But it does not have a symmetrical effect, because government debt from southern European countries, where the debt binges and current-account deficits of the past occurred, are mostly repurchased abroad.