What's for sure is that quantitative easing, whereby the "Big Four" central banks have for four years effectively created new money by expanding their balance sheets and buying mostly government bonds from their banks, is back on the agenda for all their upcoming policy meetings.

Government credit cards are all but maxed out and commercial banks' persistent instability, existential fears and reluctance to lend means the explosion of newly minted cash has yet to spark the broad money supply growth needed to generate more goods and services.

In other words, electronic money creation to date - whether directly through bond buying in the United States or Britain or in a more oblique form of cheap long-term lending by the ECB - is not even replacing what commercial banks are removing by shoring up their own balance sheets and winding down loan books.

Global investors appear convinced more QE is in the pipe.

"It is almost as if investors are saying QE will happen no matter what," said Bank of America Merrill Lynch's Gary Baker.

BoA Merrill's latest monthly survey of 260 fund managers showed nearly three in four expect the ECB to proceed with another liquidity operation by October.

Almost half expected the Fed to return to the pumps over the same period.

The BoJ has already upped asset purchases yet again this year and Bank of England policy dove Adam Posen said on Monday the BoE should not only buy more government bonds but target small business loans too.