Concerns Grow as Central Banks Push Rates into Unchartered Territories

Update - The Negative Rates Club
http://www.economist.com/news/leaders/21690031-negative-rates-club-growing-there-limit-how-low-rates-can-go-negative-creep

Concerns grow as more central banks push rates into negative territory:

http://www.bloomberg.com/news/articles/2016-02-11/racked-markets-hand-verdict-to-central-banks-on-sub-zero-rates

Related:

Negative 0.5% Interest Rate: Why People Are Paying to Save by NEIL IRWIN

http://www.nytimes.com/2016/02/13/upshot/negative-interest-rates-are-spreading-across-the-world-heres-what-you-need-to-know.html

Swedish Bank Move Creates a Global Shudder by LANDON THOMAS Jr.

http://www.nytimes.com/2016/02/12/business/dealbook/swedish-bank-move-creates-a-global-shudder.html