For comparison, the entire U.S. stock market is $25 trillion (as of 2015).
That's an unprecedented potential wave of cash.
Even a small amount moving into the market would send stocks soaring.
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http://www.garretgalland.com/passing-parade/50-trillion-in-cash-is-sitting-on-the-sidelines-today/
http://www.marketoracle.co.uk/Article57826.html