In the absence of central banks there would be no negative interest rates. From Jeff Deist at mises.org:
Do central bankers really think negative interest rates are rational?
“Calculation Error,” which Bloomberg terminals sometimes display1, is an apt metaphor for the current state of central bank policy. Both Europe and Asia are now awash in $13 trillion worth of negative-yielding sovereign and corporate bonds, and Alan Greenspan suggests negative interest rates soon will arrive in the US. Despite claims by both Mr. Trump and Fed Chair Jerome Powell concerning the health of the American economy, the Fed’s Open Market Committee moved closer to negative territory today — with another quarter-point cut in the Fed Funds rate, below even a measly 2%.
Negative interest rates are just the latest front in the post-2008 era of “extraordinary” monetary policy. They represent a Hail Mary pass from central bankers to stimulate more borrowing and more debt, though there is far more global debt today than in 2007. Stimulus is the assumed goal of all economic policy, both fiscal and monetary. Demand-side stimulus is the mania bequeathed to us by Keynes, or more accurately by his followers. It is the absurd idea, that an economy prospers by consuming and borrowing instead of producing and saving. Negative interest rates turn everything we know about economics upside down.