Because capital is usually, and legitimately, a small percentage of assets, capital can easily go to zero and a perfectly sound institution can be declared insolvent and taken over by its insurer or some other government agencies.

FORBES: Magazine Article

By 2022, says one of the authors, return on assets will hit zero.

FORBES: The Digital, Free Market Fall of America

"The BOJ will pursue powerful monetary easing by maintaining virtually zero interest rates and purchases of financial assets as long as it deems appropriate, " the statement said.

BBC: Japan agrees 2% inflation target and asset purchases