The heady rise in this year’s stock market has been powered by the tech sector, which now accounts for nearly one-quarter of the entire S&P 500 Index by market capitalization. The four so-called FANG stocks (Facebook, Amazon, Netflix, Google/Alphabet) alone generated 2 percentage points of the S&P 500’s 14 percent gain this year through September. Indeed, large-capitalization growth stocks are on quite a roll. In the 10 years from Sept. 1, 2007, through Aug. 31, 2017, large-cap growth returned 9.9 percent annualized, compared to just 7.2 percent for small-cap value stocks, which historically have been the best-performing U.S. equity asset class. In other words, during the past decade, the “small-cap premium” has become a deficit of 2.7 percentage points. Is it time to throw in the towel on small caps?