There is a small, exclusive group of companies with market caps above $1 trillion. Over time, more corporations will join this elite club. However, joining this clique is just one (albeit an impressive) milestone. Investors want to find companies that can perform well over the long run, even with market caps above$1 trillion. That's what makes Eli Lilly (LLY -2.28%) and Visa (V 0.33%) attractive. These companies have a real shot at crossing the $1 trillion mark by 2030 and look likely to deliver strong ret ...