As/if ultra lowering interest rates fail to stimulate the economy into even a modest cycle of asset/equity growth & encourage lending between commercial partners & consumer entities, then quantitative easing, or to put it another way; ‘throwing unlimited amounts of money at the problem’ is a considered course of action.
As you allude to, one of its intended purposes is to stabilize by encouraging lending to commercial & private sectors. This is achieved by flooding the marketplace with excessive liquidity. Instead of relying on interest rate reductions as the primary force to protect against deflation, the powers that be simply increase the circulation of money into the system hoping the financial institutions will lend, & thus promoting a switch to more risk based assets & kicking the merry-go-round of lending cycles again.
It’s like a type of ‘re-balancing’ process, where increasing money supply is designed to assist investors & funds to stimulate their holdings & embrace risk once more.
As with any other financial prop, trust is paramount. The institutions need to be confident that once a certain policy is engineered or put to work, it’s going to remain & not be used as some kind of vague promise. This takes time to implement & is never straightforward.
There are several working papers (a decent BoJ one) doing the rounds out there if you get your Grade A search head on & are especially desperate to cure your insomnia
Failing that, Jimmy (hawkmoon) has copies of some of the meatier items in his store cupboard. They will go some way to answering & exapnding on some of your queries.
As you're quickly realizing, some of these research modules raise just as many (further) questions as they do answers. It might prove worthwhile to get your speed-reading skills back into gear - particularly if you're coming at this endeavor from a part-time angle
I think you'll benefit from the interaction on the 'other' priv forum facility. They certainly used to toss around one or two half decent links & snippets in there. I don't suppose it's lost any of its quality since I last looked in. It's light on chart-technical content, but that's not always a bad thing.