One of the most prominent ways to quiet the bears is to point to the performance of the S&P 500. After all, this collection of 500 prominent U.S.-listed companies incorporates a diverse spectrum of business models, company missions and economic output as its basis of value. However, one of its most valuable categories — information technology stocks — could be grossly overvalued. If they tumble, so do their auxiliary supports like manufacturing and cybersecurity. This might drive investors to wonder which o ...