With the stock market trading at record highs, the "Roaring 20s" thesis is alive and well. That's according to Ed Yardeni, who expects the Dow and S&P 500 to soar 50% by 2030. "That target could ...

Overall, if current trends persist, Yardeni sees a scenario in which the Roaring 20s stock market boom extends into the next decade, which would turn Goldman's conservative outlook upside down.

Of course, the Roaring 20s from a century ago infamously ended with the stock market crash in 1929, which sparked the Great Depression that lasted through the 1930s. And for his part, Yardeni sees ...