http://krugman.blogs.nytimes.com/2015/12/02/multiplier-evidence-and-multiplier-denial/?smid=tw-nytimeskrugman&smtyp=cur&_r=0

Krugman explains and shows us “truth” simply.  But a little of this and a little of that has HUGE effects on our affect and LIFE results.  The principle holds true for financial markets but even more for our life.