Negative interest rates are a sign o an economy where asset values have been so inflated by overly stimulative policies such that the cash flows from the assets promise a negative return. This is not normal, and such policies should be discouraged, even if we get a depression as a result. Bad debts need to be liquidated so that the economy can focus on better returning assets, rather than engaging in the crony capitalism of the last 13 year that did not allow significant firms to fail.

The CFA Institute is faddish and not principled in what it writes in its blogs.