By Rick Kahler via Iris.xyz

You know we are in a long-running bull market when you see people at the gym keeping one eye on their smart phones to see if the Dow Jones Industrial Average has finally breached the 20,000 mark.

With so much uncertainty at this time last year, nobody could have predicted double-digit returns on U.S. stocks at year-end. After all, the US stock market ended 2015 in negative territory and began 2016 with the worst start since 1930, falling 10% in two weeks.

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