While in principle central banks around the world can talk up the market to infinity or until the last short has covered without ever committing to any action (obviously at some point long before that reality will take over and the fact that revenues and earnings are collapsing as stock prices are soaring will finally be grasped by every marginal buyer, but that is irrelevant for this thought experiment) the reality is that absent more unsterilized reserves entering the cash starved banking system, whose earnings absent such accounting gimmicks as loan loss reserve release and DVA, are the worst they have been in years, the banks will wither and die. Recall that the $1.6 trillion or so in excess reserves are currently used by banks mostly as window dressing to cover up capital deficiencies masked in the form of asset purchases, subsequently repoed out. Which is why central banks would certainly prefer to just talk the talk (ref: Draghi et al), private banks demand that they actually walk the walk, and the sooner the better. One such bank, which has the largest legacy liabilities and non-performing loans courtesy of its idiotic purchase of that epic housing scam factory Countrywide, is Bank of America. Which is why it is not at all surprising that just that bank has come out with a report titled "Shipwrecked" in which it says that not only will (or maybe should is the right word) launch QE3 immediately, but the QE will be bigger than expected, but as warned elsewhere, will be "much less effective than QE1/QE2, both in terms of boosting risky assets and stimulating the economy."