ZIRP (Zero Interest Rate Policy) is a method of stimulating growth while keeping interest rates close to zero. Under this policy, the governing
central bank can no longer reduce interest rates, rendering conventional monetary policy ineffective. As a result, unconventional monetary policy such as
quantitative easing is used to increase the monetary base.
Read more: ZIRP Definition | Investopedia
https://www.investopedia.com/articles/investing/031815/what-zero-interestrate-policy-zirp.asp
