In the big picture vast amounts of USA currency was dumped into the global economy by way of QE in particular to the point that the some banks no longer want those on their books. They can no longer make money on those dollars. thus we have negative interest rates. the same applies for all other currencies once you start QE or quantitative easing.
Again the established top two thirds of society is no longer able to support further borrowing and is looking to lower their exposure. The useful solution is to empower the lower third but that takes serious imagination.
When the global economy is unable to absorb capital pools it is time to worry..
Tokyo Doubles Down