The Dow Jones hitting the 20,000 mark was big news in the media last week. While the Dow is popular, the S&P 500 is more representative of the broader US economy.
According to an article by Brian Levitt at Oppenheimer Funds, the S&P 500 has had 964 new highs since its inception in 1957. In 2016 alone it had 18 new highs.
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Source: Dow 20,000: We Did It!, Brian Levitt, Oppenheimer Funds