Money - Public Domain

By estimating that zero stimulus would be consistent with a 10 percent quarterly drop in equities, they calculate it takes around $200 billion from central banks each quarter to keep markets from selling off.

With the Fed and counterparts peeling back their net liquidity injections from almost $1 trillion in 2012 toward that magic marker, King’s team said “a negative reaction in markets was long overdue.”

“We think the markets’ weakness owes more to an almost belated reaction to a temporary lull in central bank stimulus than it does to any reduction in the effect of that stimulus in propping up asset prices,” they said in an Oct. 17 report to clients.

Bank of America Merrill Lynch strategists said in a report today that another 10 percent decline in U.S. stocks might spark speculation of a fourth round of quantitative easing from the Fed. That would mimic how the Fed acted following equity declines of 11 percent in 2010 and 16 percent in 2011.

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