 :::::::::Please read the two referenced articles being discussed on their own independently.  Please understand the two different contexts of the two discussions and do not conflate the two.  One is in the context of ceteris paribus, the other a liquidity trap.  A theoretical idea exists and can be discussed even if it does not yet exist in the law books in the manner you are choosing to define it.  The foregoing should be understandable with a little reading and comprehension.   