Despite its recent rally, Nvidia stock surprisingly appears undervalued on this metric right now. Generative artificial intelligence (AI) is the hottest growth investment theme of 2023. Recent AI market estimates of US$2.6 trillion to US$4.4 trillion speak volumes about its sheer size. The huge investment opportunity lies not in just one or two AI stocks as the massive rally in Nvidia (NASDAQ:NVDA) stock would seem to imply. It extends to several stock groups that play vital roles in supporting the fast-growing AI ecosystem. Basically, three distinct groups of AI stocks have emerged for investors to evaluate as they prepare to...