Is this the most sustainable stock market bubble ever? It’s rare to find the words “sustainable” and “bubble” in the same sentence, but the stock market rally from November 2016 until now has been relentless enough to at least discuss the notion of a “sustainable bubble.” A strong start In February 2016, the S&P 500 Index SPX, -0.16% recorded three consecutive daily gains of more than 1.5%. The Profit Radar Report highlighted that this happened only eight other times. A year later, the S&P 500 was up 19.16%. The power of momentum The February 2016 kickoff rally continued to build momentum. One way to quantify momentum was shown in the Nov. 19, 2017, Profit Radar Report: “The S&P 500 was higher 8 of the first 9 months of 2017. This has only happened 8 other times (1936, 1950, 1954, 1958, 1964, 1995, 1996, 2006). 2, 3, 6, and 12 months later, the S&P was higher every time but one (0.7% loss 2 month later in 1964). Such strong momentum readings (and they are seen across all time frames) are extremely rare. As mentioned in December 2016 and March 2017, stocks rarely top out at peak momentum. We have to go back to 1995/1996 to find similarly strong and persistent upside momentum.”via